Learn how to work out the factors of a number using a diagrammatic representation and factor trees in this KS3 maths study guide from BBC Bitesize.

Since we've already established the factors of 36, we simply need to see which factors of 36 are also prime numbers. In this case, of the factors already listed, we can see that 2 and 3 are the ...

The three smallest prime numbers are 2, 3 and 5. It's easy to find out if small numbers are prime — one simply needs to check what numbers can factor them.

For the first time in more than 25 years, mathematicians have proven a new way to identify prime numbers, and in doing so developed a toolkit that could allow further advances in number theory.

The three smallest prime numbers are 2, 3 and 5. It's easy to find out if small numbers are prime—one simply needs to check what numbers can factor them.

Prime Numbers: Check definition of prime numbers, list from 1 to 1000, examples, applications and frequently asked questions regarding prime numbers.