31 is a Prime number. A prime number has only 2 factors which are 1 and itself. Composite numbers are everything else except 1 and 0. 1 and 0 are neither prime, nor composite.
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31 is prime. 32 and 33 are composite.
31 is prime.
31 is prime.
Prime; Are, 2,3,5,7,11,13,17,19,23,29
31 is a prime number because it is only divisible by 1 and itself.