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Anonymous
81 is a composite number since it has at least one factor that is not itself or 1.It's composite: 81 = 9 x 9 (or 9^2) and 3 x 27 (other than 81 x 1).
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81 is not prime it's a composite number
81 is not prime, it is composite.
Composite
81 is a Composite Number
81 is an odd composite number.