81 is a composite number because it has more than two factors.
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It is a composite number, you can get 81 by mulitpling 1*81, 3*27, and 9*9.compositeNo the number 81 is not prime it can be divided by nine.composite
81 is a composite number because its factors are more than 2
61 and 71 are prime numbers the rest are composite numbers
81 = 3*3*3*3
81 is not a prime number. Its positive integer factors are: 1, 3, 9, 27, 81.81 is a Composite Number.