87 is a composite number
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25 is the only composite number out of 31, 29, 25, 23.
2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31 are prime numbers. they are not composite numbers.
29 and 31 are prime. The rest are composite numbers.
23, 29 and 31 are prime. The rest are composite.
All of them except for 29 and 31 which are prime numbers