81=3*3*3*3
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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
Because it has more than two factors and it is also a square number in which 9 times 9 = 81
81 is a composite number as it has factors other than 1 and itself (3, 27 and 9).
The factors of 81 are 1, 3, 9, 27, and 81 .