# Method Gmp.mpz()->probably_prime_p()

Method probably_prime_p

  `bool probably_prime_p(int count)`

Description

  Return 1 if this mpz object is a prime, and 0 most of the time if it is not.

Parameter `count`

  The prime number testing is using Donald Knuth's probabilistic primality test. The chance for a false positive is pow(0.25,count). The higher value, the more probable it is that the number is a prime. Default value is 25.