Prime numbers are easy to identify because they are only divisible by themselves and the number 1. Thus,

2 is prime, since is is only divisible 1 by 1 and 2

5 is prime, since it is only divisible by 1 and 5

59 is prime, since it is only divisible by 1 and 59

64 is NOT prime, since it is divisible by numerous numbers (1, 2, 4, 9, etc.).

Thus, the answer is 64.

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...64 is not a prime number, because it can be further factored: 2 x 2 x 2 x 2 x 2 x 2.

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