31 is prime. 32 and 33 are composite.
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31 is a prime number. It has no positive integer factors apart from itself and 1.
279 is a composite number. Its positive integer factors are: 1, 3, 9, 31, 93, 279
31 is prime.
31 is prime.
Prime; Are, 2,3,5,7,11,13,17,19,23,29