Basics of maths

Even and Odd Numbers in Maths

Integers are a set of numbers which do not have fractional part, they can be positive, negative or zero.
Integers which are divisible by 2 are known as even numbers. In other words, numbers whose unit place is 0, 2,4,6,8 are divisible by 2 and such numbers are even numbers.
In contrast, to even numbers, integers which are not divisible by 2 are known as odd numbers. They have 1, 3,5,7,9 at their unit place.

Prime and Composite Numbers in Maths

 A natural number which has exactly two factors, i.e.  1 and the number itself, is a prime number. In simple words, if a number is only divisible by 1 and itself ,then it is a prime number.  Every prime number is an odd number except the number 2.

For example:  

2, 3, 5, 7, 11, 19, 37, 41, 313, 241 etc.

Every non-prime number is a composite number. Composite numbers are those natural numbers which have more than two factors. Such numbers are divisible by other numbers as well.

For example:

4, 6, 8, 10, 12, 14, 500, 6000  etc.

Some facts about prime numbers and composite numbers are:

• 1 is neither prime nor composite.

• The only even number which is a prime is 2. It is the smallest prime number.