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 than two factors.
81 is a composite number because its factors are more than 2
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.
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.
81 is not prime it's a composite number
81 is an odd composite number.
It is a composite number.
81 is a 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 a composite number because its factors are more than 2
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 = 3*3*3*3
81 is not prime, it is composite.
81 is not a prime number. Its positive integer factors are: 1, 3, 9, 27, 81.81 is a Composite Number.
81 is a composite number as it has factors other than 1 and itself (3, 27 and 9).