The so-called prime number, or prime number, is a positive integer except its sum.

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There are no other factors. take for example

2,3,5,7

Is a prime number and

4,6,8,9

It's not. The latter is called composite number or composite number. From this point of view, integers can be divided into two types, one is called prime number and the other is called composite number. (Some people think that numbers

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The famous gauss "unique decomposition theorem" says that any integer. It can be written as the product of a series of prime numbers.