81
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81 is a composite number.
81 is not prime it's a composite number
81 is a composite number. Composite numbers are any number that has more than two factors(one and itself). Therefore, since 3,9, and 27 are factors of 81 that makes it a composite number.
81 is an odd composite number.
29, 61, 23, 97, 41, and 67 are prime. 81, 51, 93, 77, and 39 are composite.