If you mean: 53 81 41 47 and 31 then 81 is a composite number while all the rest are prime numbers
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All of them except for 31, 37, 41, 43 and 47 which are prime numbers.
31 and 47 are prime, the rest composite.
Of these, 45 is the only composite number. All the others are prime.
Yes.
37, 41, 43, 47