The online computer game “Is this prime?” tests a player’s knowledge of prime numbers—and just surpassed 2,999,999 attempts. Give it a whirl.

The largest known prime number has been discovered by a computer at a university in Missouri in the US. Prime numbers - such as two, three, five and seven - are divisible only by themselves and ...

Prime numbers can only be divided by themselves and 1. Find out how to work out if a number is a prime in this Bitesize Primary Second Level Maths guide.