A number has countless multiples, the largest is positive infinity and the smallest is negative infinity. In mathematics, positive integers and 0 are collectively called natural numbers. In integers, it can also be divided into odd and even numbers. Odd numbers are integers divisible by 2, and even numbers are integers divisible by 2.

There are positive numbers in mathematics, which are positive real numbers, including positive integers, positive fractions and positive irrational numbers. So there is no minimum number and no maximum number for positive numbers. In addition, negative numbers include negative integers, negative fractions and negative irrational numbers. Similarly, negative numbers have no minimum and maximum numbers. 0 is neither positive nor negative. Rational numbers and irrational numbers add up to real numbers.

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An integer can be divisible by another integer, so this integer is a multiple of another integer. Definition: The common multiple of two or more integers is called their common multiple. The least common multiple of two or more integers is called their least common multiple.

An integer can be divisible by another integer, which is a multiple of another integer. For example, 15 can be divisible by 3 or 5, so 15 is a multiple of 3 and 5. The quotient obtained by dividing one number by another. For example, a÷b=c, that is, A is a multiple of B, for example, A÷B=C, it can be said that A is C times that of B.