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Even, Odd, Prime and Composite Numbers

Even, Odd, Prime and Composite Numbers

Even and Odd: Any integer which is divisible by two is called an even number. Any integer which is not divisible by two is called an odd number.

N.B.: Zero has not been categorized in either of the two categories.

Prime  and  Composite :  Any  integer  which  is  divisible  by  1  and  itself  only  is  called a  prime  number. All integers which are not prime are called composite number as they are composed of two or more prime numbers.

N.B.: 1 is not a prime number.

Positive and negative:  Any number which is greater than 0 is positive. Any number less than that is negative.

Perfect numbers:- If the  sum of the divisors of N, excluding N itself, is equal to N, then N is called a perfect number. e.g. 6, 28, 496, 8128 etc.

6 = 1 + 2 + 3;

28 = 1 + 2 + 4 + 7 + 14;

496 = 1 + 2 + 4 + 8 + 16 + 31 + 62 + 124 + 248.

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