23
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The greatest prime number below 25 is 23.
It is 2 and which is the only even prime number
5 is prime.
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.
25 is not a prime number since it can be evenly divided by 5 as well as 1 and 25.