In primary school mathematics, two positive integers are multiplied, so both numbers are called factors of product, or divisors. The integer a can be divisible by the integer b, a is called a multiple of b, and b is called a factor or divisor of a ... within the range of natural numbers, that is, the factor must be an integer. Example: 6 ÷ 2 = 3, 1, 2,3,6 is a factor of 6. The factors of 6 are: 1 and 6, 2 and 3; The factor of 10 is; 1 and 10, 2 and 5; The factors of 15 are: 1 and 15, 3 and 5; About the factor regulation: for any number, 1 and itself are their own factors.

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Divisibility: If the integer A is divisible by the non-zero integer B, the quotient is an integer and the remainder is zero, we say that A is divisible by B (or B is divisible by A) and it is recorded as B | A. ..

Prime number (prime number): A natural number with exactly two positive factors. (or defined as a number that cannot be divisible by other natural numbers except 1 and the integer itself among natural numbers greater than 1).

Composite number: There are other positive factors besides 1 and itself.

1 has only a positive factor of 1, so it is neither a prime number nor a composite number.

If A is a factor of B and A is a prime number, then A is a prime factor of B ... For example, 2, 3 and 5 are all prime factors of 30. 6 is not a prime number, so it doesn't count. 7 is not a factor of 30, so it is not a prime factor.

Two nonzero natural numbers whose common factor is only 1 are called coprime numbers.

The number of positive factors of 1 nonzero natural number is limited, of which the smallest is 1 and the largest is itself. The multiples of nonzero natural numbers are infinite.