81 is a composite number as it has factors other than 1 and itself (3, 27 and 9).
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Composite
81 is not prime it's a composite number
A prime number has only 2 factors which are 1 and itself. Composite numbers are everything else except 1 and 0. 1 and 0 are neither prime, nor composite. 81 is composite, 111 is prime.
81 is a Composite Number
81 is an odd composite number.