A Prime number is a positive integer with two factors: one and the number itself. If you test the numbers up to the square root and your number is not divisible by any of them, it's prime.
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It is a prime.
if it has no other number that can divide into itself but itself ================================== Another contributor clarified: You have to determine whether there is any number ... besides '1' and the number under test itself ... that can divide evenly into the number under test. If you find even one, then it's not a prime. If there are none, then it's a prime.
the prime factorization of 56 is a prime number that are only divisible by twounique factors.
If a number is divisible by 3 or more numbers than that number is composite, if not than it is prime.
295 is composite - 5 x 59.