81 is an odd composite number.
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An even number can be divided by 2 evenly. An odd number will have a remainder of 1 when divided by 2. 81 is an odd number.
81 is not prime it's a composite number
no because 81 is an odd number. only even numbers are divisible by 2 evenly.
81 is not a prime number. 81 = 3 * 3 * 3 * 3
No.