13 ÷ 6 = 2 remainder 1.ġ5 is not an example of a prime number because it can be divided by 5 and 3 as well as by itself and 1. That is because its only divisors are 1 and 13.ĭividing a prime number by another natural number results in numbers left over e.g. E xamples of prime numbersĪn example of a prime number is 13. The fundamental theorem of arithmetic states that a composite number can be expressed as the product of prime numbers. Prime numbers are often seen as ‘building blocks’ by mathematicians in number theory.
What is a prime number?Ī prime number is a whole number greater than 1 with only two factors – itself and 1.Ī prime number cannot be divided by any other positive integer without leaving a remainder, decimal or fraction. In this guide, we will explain what exactly this means, give you a list of prime numbers children need to know at primary school, and provide you with some practice questions to find prime numbers. A prime number is a number that can only be divided by itself without remainders.
