This is a question which stumps many test takers. So, let’s set the record straight. The number 1 is **NOT** a prime number. To understand this, you need to know the definition of prime numbers.

A prime number is a number which has two different factors: itself and 1. In other words, it should be divided by itself and 1. In the case of 1, it has only one factor – itself!

For exam purposes, it is a good idea to learn the first few prime numbers. The first prime number is 2. The first few prime numbers are 2, 3, 5, 7, 11, 13, 17, 19, 23…

## What else you can do inside qs leap ?

Just for the record, 2 is the only even prime number.