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Largest known prime number. As of January 2017, the largest known prime number is 274,207,281 â 1, a number with 22,338,618 digits. It was found in 2016 by the Great Internet Mersenne Prime Search (GIMPS). Plot of the number of digits in largest known prime by year, since the electronic computer. Note that the vertical scale is logarithmic. The red line is the exponential curve of best fit: y = exp(0.187394 t - 360.527), where t is in years.
There is only one prime number between 91 and 100. All other blocks of ten have at least two prime numbers. The â3âs column has the most prime numbers between 1 and 100. Composite numbers. Numbers that arenât prime are a mix of colours. For example, 15 is 5Ã3 where 5 is blue and 3 is green, so 15 is half blue and half green. All multiples of 6 have to have orange (2) and green (3) in them. Any number ending in 4,6,8 or 0 isnât a prime number.