Question

Which of the following is a prime number (a)9 (b) 8 (c) 4 (d) 2?

Answer 1

Hi user!

A prime number is a number that has no other factors except 1 and the number itself.
For example:5,13,17 etc.
From above options,
(a) 9
    Factors are 1,3,9
    NOT A PRIME NUMBER
(b) 8 
     Factors are 1,2,4,8
     NOT A PRIME NUMBER
(c) 4
     Factors are 1,2,4
     AGAIN NOT A PRIME NUMBER
(d) 2
    Factors are 1,2
    IT IS A PRIME NUMBER

So, your answer is 2.

Goodbye!