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Q: Is 81 a prime or composite number?

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81 is not prime it's a composite number

It is a composite number.

81 is a Composite Number

81 is an odd composite number.

81 is a composite number because it has more than two factors.

81 is a composite number and it is also a square number

81 is not prime, it is composite.

81 is a composite number because its factors are more than 2

The greatest common factor of a prime number & a composite number is 1 if the composite number is not divisible by the prime number. 81(composite number) is not divisible by 29(prime number) so, gcf(29,81) = 1.

81 = 3*3*3*3

It is composite.

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 a composite number because it has factors other than 1 and itself. 81 is not a prime number. 81 = 3 * 3 * 3 * 3. Its positive integer factors are: 1, 3, 9, 27, 81.

81 is a composite number because it has more factors than 1 and itself. The factors of 81 are 1, 3, 9, 27, and 81.

81 is not a prime number. Its positive integer factors are: 1, 3, 9, 27, 81.81 is a Composite Number.

Composite because it has more than two factors.

81 is a composite number as it has factors other than 1 and itself (3, 27 and 9).

It is composite.

It is composite.

How about 81 or any number that is not a prime number.

Composite

81 is not a prime number, it is the product of 9 X 9.

41 is prime. 51 is composite. 51=3 x 17 . 71 is prime. 81 is composite. 92 91 is composite. 91 = 7 × 13

81 = 92 = 34 So 81 is not prime

81 is 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.