12 written as a product of prime factors is 2 x 2 x 3. What is 30 written using prime factors?

Which of the following is not a prime factor of 42?

Key Stage 3

Prime factors

A number divides into another number leaving a remainder

A number that divides exactly into another number without leaving a remainder

A number that multiplies another number to get another number

A number that can be divided by even numbers only

A number that can be divided by itself and one only

A number that can be divided by more than two factors

Because they always have a repeated factor

Why do square numbers have an odd number of factors?