Answer
Composite
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.
Elementary Algebra
by Kaufmann, Jerome; Schwitters, Karen;
Published by
Cengage Learning
ISBN 10:
1285194055
ISBN 13:
978-1-28519-405-9
Chapter 1 - Some Basic Concepts of Arithmetic and Algebra - 1.2 - Prime and Composite Numbers - Problem Set 1.2 - Page 13: 36
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