| A | B |
| abundant number | number with proper factors that add to more than the number |
| common factor | factor that two or more numbers share |
| common multiple | multiple that two or more numbers share |
| composite number | whole number with factors other than itself and 1 |
| deficient number | number with proper factors that add to less than the number |
| divisor | factor of a number |
| even number | multiple of 2 |
| exponent | number that tells how many times a factor is used |
| multiple | product of a given whole number and another whole number |
| odd number | whole number that is not a multiple of 2 |
| perfect number | number with proper factors that add to exactly the number |
| prime factorization | longest factor string for a number composed entirely of prime numbers |
| prime number | number with only two factors |
| proper factors | all the factors of number except the number itself |
| square number | product of a number with itself |