a. B is any two integers, where B ≠ 0. If a can be divided by B, then a is called a multiple of B and B is called a divisor (also called a factor); If a cannot be divided by the natural number B, then a is not a multiple of B, or B is not a divisor of A.
For example: 8 ÷ 4 = 2, 8 is a multiple of 4, and 4 is a divisor of 8.
For example, 2 cannot divide 7, so 7 is not a multiple of 2 and 2 is not a divisor of 7.
Divisors and multiples show the relationship between two numbers, so they are interdependent "twins".