A Prime Number is a number which cannot be made by multiplying any other numbers together.
6 IS NOT
a Prime Number because it can be made from 2 x 3.
7 IS a Prime
Number. It cannot be made by multiplying any other numbers except 1 and itself.
1 IS NOT a Prime
Number because the definition of a Prime Number is that it must have 2 factors,
itself and one. Therefore one cannot be a Prime as it only has 1 factor.
Use our special online
machine to test if a number is a Prime Number.
(Do not enter a number with more than 5 digits - it may take
the computer a long time to work out!)
Which is the biggest Prime Number below 100?
How many Prime Numbers are there between 1 and 20?
Can you make up some strategies to help find Prime Numbers without testing every number?