Is 81 composite or prime?
Understand the Problem
The question is asking whether the number 81 is a composite number or a prime number. A prime number has only two distinct positive divisors: 1 and itself, while a composite number has more than two positive divisors.
Answer
81 is a composite number.
The final answer is 81 is a composite number.
Answer for screen readers
The final answer is 81 is a composite number.
More Information
81 is divisible by numbers other than 1 and itself, such as 3 and 9. In fact, 81 = 3^4.
Tips
A common mistake is to not check divisibility by smaller prime numbers when determining if a number is prime.
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