
Concept explainers
To find whether the number 21 is prime or composite.

Answer to Problem 26E
The number is composite.
Explanation of Solution
Given Information: Number 21.
Formula used: To check if the numbers is prime or composite ,find its factors. If its factors are more than 2(except 1 and the number itself), then the number is composite else prime.
Calculation:
To determine if 21 a prime number or a composite number, simply look at the factors for 21.
If the factors of 21 are only 21 and 1, then 21 is a prime number. Otherwise, 21 is a composite number.
The factors of 21 are as follows:
1, 3, 7 and 21
Therefore, since 21 is divisible by more than one and itself, the number is composite.
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