Which of the following is not a prime number?

Question

নিচের অপশন গুলা দেখুন

• 37
• 11
• 21
• 5

Answer 1

সঠিক উত্তর হচ্ছে: 21

ব্যাখ্যা:

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.