What is a Prime Number in Mathematics?

A prime number is a whole number that can only be divided by itself and the number 1 without leaving a remainder. All prime numbers with the exception of the number 2 are odd numbers. For example 5 can is only divisible by 5 and 1. Examples of prime numbers are 2, 3, 5, 7, 11, 13, 17 and the list goes on.