On Jan. 25, 2013, the largest known Prime number, 257,885,161-1, was discovered on Great internet Mersenne Prime Search (GIMPS) volunteer Curtis Cooper's computer. The new prime number, 2 multiplied by itself 57,885,161 times, less one, has 17,425,170 digits.
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There is no biggest prime number: they go on for ever.
997 is the biggest 3 digit Prime number.
-1 isn't prime.
Seventeen is the next prime number after fifteen.
The largest 2-digit prime number is 97.