81 is a composite number since it has at least one factor that is not itself or 1.
It's composite: 81 = 9 x 9 (or 9^2) and 3 x 27 (other than 81 x 1).
81 is not prime it's a composite number
81 is not prime, it is composite.
Composite
81 is a Composite Number
81 is an odd composite number.
81 is not prime it's a composite number
81 is not prime, it is composite.
It is composite.
Composite
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 it has more than two factors.
3 is prime. Rest are composite.
81 is a composite number because its factors are more than 2
It is a composite number.
81 is a Composite Number
81 is an odd 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.