138 is not prime. 138 = 2 * 3 * 23
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The factors of 138 are: 2 x 69 3 x 46 6 x 23 So the prime numbers of 138 would be 3, and 23.
Composite
138 = 2 * 3 * 23
8.625 is 6.25 percent of 138. .0625X138 = 8.625
To find 21 percent of a number, multiply the number by 0.21. In this instance, 0.21 x 138 = 28.98. Therefore, 21 percent of 138 is equal to 28.98.