Concepts

Question 1

Is 1 a prime number?

Answer 1

1 is not a prime number because it has only one factor, namely 1. Prime numbers need to have exactly two factors

Question 2

Is 2 a prime number?

Answer 2

2 is a prime number because it has exactly two factors – itself and 1.

Question 3

Is 51 a prime number?

Answer 3

51 is not a prime number because it can be divided by 3 and 17, as well as by itself and 1. ie it has four factors.