There is no point in changing all the strings, especially since the remaining ones are so new.
When comes the time for total replacement in 6 months, a year, depending how much it gets played, then yes, change them all.
I'm pretty sure
singles are available, but if not, a whole set isn't going to break the bank, and having spares is a sensible situation to be in.
Bit like that insurance policy - useless until it's needed!
As a new violinist, be very careful you tune to the correct notes, and not an octave higher.
Seen it happen, not a pretty sight.
music.stackexchange.com/users/2808/Tim
Hint: Get into the habit of slackening off your fine tuner when you are changing a string.
This will give you more adjustment after you have roughly tuned it with the tuning peg and for subsequent tuning adjustments.
Your violin is unlikely to get bumped 'sharp', so you will rarely need to fine tune it down far.
For the first time, maybe it's best to ask the music store to fit the new string.
Watch the way they do it.
For example, it's good to make sure that the string windings stay near the outside of the peg box, rather than the centre.
That will stop the peg from slipping outwards and loosening its grip in the peg hole.
music.stackexchange.com/users/39533/Areel Xocha
You can absolutely buy individual violin strings.
Many players use an E string that doesn't match the brand of their other strings.
A generic music shop probably doesn't do enough volume to sell anything other than sets, but a shop that caters to string players will have the individual strings.
There may be one locally, or you can order online.
The three stores I've bought from online are Shar music, Johnson Violin, and Southwest Strings.
There are certainly other reputable shops as well.
You mention having the music store put in your string.
Ask them to show you how to change the string, because it is very simple and something every student should know.
They may charge a small fee, especially if you don't buy the string from them.
music.stackexchange.com/users/10353/Karen
From experience, violinists don't actually like the timbre of new strings.
While guitarists typically chase the timbre produced by a fresh set of strings, violinists prefer the timbre of strings that have at least bedded in, and will only replace strings if they break, start to unwind or develop an undesirable tonal artifact.
With this in mind, I think it would be more typical for a violinist to replace a single string than to replace all four when one breaks.
The other thing to note here is the cost of violin strings.
Beyond purchasing a spare set for emergencies, it could get fairly costly fairly quickly were you to replace all four strings whenever one broke.
music.stackexchange.com/users/30365/ABragg
The thing to keep in mind when replacing single strings is to find the gauge of the broken string and get an individual string of the same gauge.
This way, the original setup of your violin stays intact.
Usually, a music store should have a device to measure the gauge.
So I advice you to find another store to get it replaced.
music.stackexchange.com/users/40554/Shashank
I suggest you replace the strings that came with your violin within 6 months.
It probably is not of the greatest quality unless you bought a 4000 dollar violin.
Keep at least 2 sets of spares safely.
They may get damaged on exposure to extreme atmospheric conditions.
After a while adjust your set up mixing and matching different strings of different brands and gauges to your preference.
music.stackexchange.com/users/42746/Tarun
I just received my violin  2 days ago .  My E string broke when I tuning it.  I enquired nearby musical instrument store and they only sell the whole set of strings.  So, do I have to replace all strings or I keep G, D, A strings and only replace E string?
Do I have to replace all violin strings when E string broke?
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<strings><violin><string-instruments>
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music.stackexchange.com/users/39893/Chek Wei Tan
 You can absolutely buy individual violin strings. A generic music shop probably doesn't do enough volume to sell anything other than sets,  but a shop that caters to string players will have the individual strings. There are many reputable specialist stores and you can also buy strings online. Ask the store to show you how to fit the string as all students should know how to do that. You can absolutely buy individual violin strings.
You can absolutely buy individual violin strings. Many players use an E string that doesn't match the brand of their other strings. Ask them to show you how to change the string,  because it is very simple and something every student should know. They may charge a small fee,  especially if you don't buy the string from them. The three stores I've bought from online are Shar music, Johnson Violin, and Southwest Strings.