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Even or odd number

Natural numbers can be divided into even and odd numbers.



The natural numbers can be ordered in several ways.

Natural numbers Even numbers Special case: 0
Composite numbers Squares of even numbers
Numbers not perfect squares
Only prime number: 2
Odd numbers Prime numbers 4n + 1 primes
4n + 3 primes
Composite numbers Squares of odd numbers
Numbers not perfect squares
Special case: 1


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