If the integer n is divided by m, the result is an integer without remainder, then we call m a factor of n, and the factor is a concept in the integer. The number of factors of integer n is the number of all factors including itself. For example, the factor of 12 is 6( 1, 2,3,4,6, 12).

What is an integer? Integers are numbers like 0, 1, 2, 3,-10, 1 3, 10, etc.

All integers form an integer set, which is a number ring. In the integer system, zero and positive integers are collectively called natural numbers. -1, -2, -3, …, -n, …(n is a non-zero natural number) are negative integers. Positive integers, zero integers and negative integers form an integer system. Integers exclude decimals and fractions.

What is the primary factor? In number theory, the prime factor of a positive integer refers to a prime number that can be divisible by a number.

Two positive integers without homogeneous factors are called coprime.

The number 1 is prime with any positive integer (including 1 itself).

Factorization of positive integers gives a series of prime factors; After all the quality factors are multiplied. Quality factors, such as repetition, will be expressed by index.

For example, the prime factors of 6 are 3 and 2(6=3×2). 5 has only 1 prime factor, and 5 itself (5 is a prime number).