Note:  Do not rely on this information. It is very old.


Factor, in mathematics, means any number which will divide into another without remainder. The number 36 may be produced by the multiplication of 3 and 12; 3 and 12 are said to be factors of 36; so also 9 and 4 are factors of the same number. In fact, any number that will divide exactly into 36 is a factor of 36. There are numbers that are divisible only by unity, such as 7, 11, 13, 17, 19, 23, and so on. Such are termed prime numbers.