A prime number is a number with exactly two factors. Prime numbers are only divisible by 1 and itself. Another way to think of prime numbers is that they are only ever found as answers in their own ...

A team of researchers, including a Google engineer, has produced a proof that shows that no initial Rubik's Cube position needs over 20 moves to solve. Prior to this, researchers had narrowed down the ...

Which is 9. So 9 is a square number. Here are some other examples of square numbers. Can you see how all these numbers can be arranged into a square? Which is 64. So 64 is a cube number. Here are some ...