Work Step by Step
RECALL: A number is composite if it has factors other than itself and 1. A number is prime if its only factors are 1 and itself. Note that: $81 = 9 \times 9$ Thus, the given number is composite.
You can help us out by revising, improving and updating this answer.Update this answer
After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.