Basic College Mathematics (10th Edition)

Published by Pearson
ISBN 10: 0134467795
ISBN 13: 978-0-13446-779-5

Chapter 2 - Multiplying and Dividing Fractions - 2.3 Factors - 2.3 Exercises - Page 130: 28



Work Step by Step

A prime number is a whole number that has exactly two factors, itself and the number 1. Any number besides 0 and 1 that are not prime are composite. The number 45 is not prime, because $3\times15=45$, for example. Therefore, 45 has factors besides 1 and 45, so it must be a composite number.
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