31 and 61 are prime numbers. The prime numbers between 31 and 61 are 37, 41, 43, 47, 53, and 59.
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31/61 is a simplified fraction because 31 and 61 are both prime numbers.
13 prime 63 composite 61 prime 31 prime Well the question should have been either, Which one of these numbers is not a composite number? Or, Which one of these numbers is not a prime number?
31 37 41 43 47 53 59 61.
100
61 is already prime.