Is 81 a prime or composite number?
Understand the Problem
The question is asking whether the number 81 is a prime number or a composite number. A prime number has exactly two distinct positive divisors, while a composite number has more than two. In this case, we will determine the divisibility of 81 to classify it.
Answer
composite
The final answer is composite
Answer for screen readers
The final answer is composite
More Information
The number 81 is a composite number because it has factors other than 1 and itself. Specifically, 81 can be divided by 1, 3, 9, 27, and 81.
Tips
A common mistake is to think a number is prime if you can't quickly find a factor. Remember to thoroughly check for all possible divisors up to the square root of the number.
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