# Chapter 1 - Review Exercises - Page 108: 19

composite; $2^{2} \cdot 3 \cdot 5$

#### Work Step by Step

RECALL: A prime number is a number whose only factors are 1 and itself. A composite number is a number with factors other than one and itself. $60$ is an even number so 2 is one of its factors. Thus, $60$ is a composite number. Factor $60$ completely to have: $60 \\=2(30) \\=2(2)(15) \\=2(2)(3)(5)$ $\\=(2^{2})(3)(5)$ The prime factorization of $60$ is: $2^{2} \cdot 3 \cdot 5$

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