Which one of the following is not a prime number? A. 89 B. 79 C. 87 D. 67

Given: The numbers 89, 79, 87 and 67

To find: The number which is not a prime number

Solution:

A prime number should not be divisible by any number other than 1 and itself.

 87 is not a prime number: because 8 + 7 = 15.

15 is a multiple of 3. So 87 is divisible by 3.

So answer is C

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Updated on: 10-Oct-2022

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