A factor divides a number exactly, with nothing left over. Every number has factor pairs: for 24, they are 1 × 24, 2 × 12, 3 × 8, and 4 × 6.

A multiple is what you get when you multiply the number by a whole number. The primes are the numbers greater than 1 whose only factors are 1 and themselves, and every number is built by multiplying primes together. Choose a view above to see each one for the number you pick.