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 ...

Take two positive whole numbers that are both less than 20. The difference in the squares of these numbers is a perfect cube and the difference in their cubes is a perfect square. (Perfect means that ...

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 ...