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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.
Some facts: 1  The only even prime number is 2. 2  If the sum of a number's digits is a multiple of 3, that number can be divided by 3. 3  No prime number greater than 5 ends in a 5. 4  Zero and 1 are not considered prime numbers. 5  Except for 0 and 1, a number is either a prime number or a composite number.