61 is a Prime number
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61 is a prime number
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?
51 composite, 61 prime.
61 is prime 28 = 4 x 7 = 2 x 14 83 is prime 29 is prime
Any number except 61 67 71 73 and 79 which are prime numbers