81 is a composite number.
81 is not prime it's a composite number
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.
29, 61, 23, 97, 41, and 67 are prime. 81, 51, 93, 77, and 39 are composite.
81 is an odd composite number.
61 and 71 are prime numbers the rest are composite numbers
81 is a composite number.
81 is not prime it's a composite number
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
Both 81 and 313968 are composite numbers.
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.
It has more than two distinct factors; they are 1, 3, 9, 27, 81
81 is a composite number because it has more than two factors.
29, 61, 23, 97, 41, and 67 are prime. 81, 51, 93, 77, and 39 are composite.
81 is an odd composite number.
81 is a composite number and it is also a square number