2. Mathematical concept of factor: factor is also called factor. If an integer is divisible by another integer, the former is called a factor of the latter. For example, 1, 3,5 and 15 are all factors of 15. Also known as factor. If a polynomial is divisible by another polynomial, the former is called a factor of the latter. For example, m- 1 is a factor of ㎡- 1. Also known as factorization.