Definition of multiple: An integer can be divisible by another integer, so this integer is a multiple of another integer.
Extended data:
Historically, countries have always had two regulations on whether 0 is a natural number: one stipulates that 0 is a natural number and the other stipulates that 0 is not a natural number.
China's primary and secondary school textbooks originally stipulated that natural number set does not include 0. But outside China, most mathematicians stipulate that 0 is a natural number. In order to facilitate international exchanges, national standards stipulate that natural number set includes 0.
Therefore, in our newly published textbooks, according to "national standards", the set of natural numbers is called the set of positive integers in modern times. At the same time, we also use some mathematical symbols according to the national standards.
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