61 is prime
28 = 4 x 7 = 2 x 14
83 is prime
29 is prime
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61 is a prime number
51 is composite.
They are: 61+67 = 128 or if you mean 29+37 = 66
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?