Relation between numbers

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Prime Numbers

Numbers having factors and number itself are known as prime numbers.
As for example, take number .
Factors of are and
Therefore, is a prime number.

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Composite Numbers

Composite numbers are numbers which have at least one factor other than number itself and .
Examples of composite number are   , , .
Factors of are

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Fundamental Theorem of Arithmetic

Any integer greater than is either a prime number, or can be written as a unique product of prime numbers