Arithmetic Course/Types of Number/Natural Number

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Natural Number[edit]

Natural Number is a set of all digits from 0 to 9

N = {1,2,3,4,5,6,7,8,9}

Even Number[edit]

Natural Number divisible by two is called Even Number

2N = {2,4,6,8}

Odd Number[edit]

Natural Number not divisible by two is called Odd Number

2N + 1 = {1,3,5,7,9}

Prime Number[edit]

prime number"p"" is the number that have 4 divisors [p,-p,1,-1]