Chapter 1 - Some Basic Concepts of Arithmetic and Algebra - 1.2 - Prime and Composite Numbers - Problem Set 1.2 - Page 13: 41

$118=2\times59$

Since the last digit of 118 is an even number, 118 is divisible by 2. When we divide 118 by 2, we get 59. 59 is not divisible by any number except 1 and is therefore a prime number. Since 2 and 59 are prime factors, the prime factorization of 118 is $2\times59$.