
Concept explainers
To find whether the number 121 is prime or composite.

Answer to Problem 28E
The number is composite.
Explanation of Solution
Given Information: Number 121.
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 121 a prime number or a composite number, simply look at the factors for 121.
If the factors of 121 are only 121 and 1, then 121 is a prime number. Otherwise, 121 is a composite number.
The factors of 121 are as follows:
1, 11 and 121
Therefore, since 121is divisible by more than one and itself, the number is composite.
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