51 composite, 61 prime.
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29, 61, 23, 97, 41, and 67 are prime. 81, 51, 93, 77, and 39 are composite.
51 is composite.
51 is composite.
61 is a prime number. 49 is not a prime number as it is divisible by 7. 51 is not a prime number as it is divisible by 3.
61 is a prime number