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6
Q:

Which of the following is not a prime number?

A) 5 B) 11
C) 21 D) 37

Answer:   C) 21



Explanation:

A prime number is a whole number greater than 1 whose only factors are 1 and itself.

 

Factors of 5 are 1, 5

Factors of 11 are 1, 11

Factors of 21 are 1, 3, 7, 21

Factors of 37 are 1, 37.

 

Hence, according to the definition of a prime number, 21 is not a prime number as it has more than two factors.

Subject: Numbers
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