In this KS2 Maths article you’ll learn techniques to find out if a number is a prime number. We also have a KS2 Maths quiz and lots of examples.

Video summary * This film clip introduces prime numbers, composite numbers and factors. We state that the number “1” is neither prime nor composite. The idea of factor pairs is introduced.

For instance, the largest known prime number, which is 2 136279841 − 1, is 41,024,320 digits long. At first, that number may seem mind-bogglingly large.

At over 23 million digits long, the new number has been given the name M77232917 for short. Prime numbers are divisible only by themselves and one, and the search for ever-larger primes has long ...

Prime numbers, the "atoms of arithmetic," have captivated mathematicians for centuries. These numbers, divisible only by themselves and one, appear deceptively random yet hide intricate patterns.