# CLASS-4PRIME & COMPOSITE NUMBERS

PRIME & COMPOSITE NUMBERS -

PRIME NUMBERS:-

A number which has only two factors, namely one and the number itself is called a prime number. Composite numbers are the numbers which having more than two factors, i.e., other than 1 and the number itself.

Example: 11 is a prime number as it has only two factors 1 and 11.

11 ÷ 1 = 11.

Factors of 11 are 1 and 11.

Example - 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47,...........................

COMPOSITE NUMBERS:-

Example: 15 is a composite number as it has more than two factors.

15 ÷ 1 = 15

15 ÷ 5 = 3

15 ÷ 3 = 5

Factors of 15 are 1, 3, 5, and 15.

Other than 1 and 15, it has a third & fourth factor 35 So, 15 is a composite number.

Example - 4, 6, 8, 9, 10, 12, 14, 15, 16, 18, 20, 21, 22, 24, 25, 26, 27, 28, 30, 32, 33, 34, 35,....................

NOTE :-

· One is not a prime number, since it has only one factor.

· Two is the only even prime number.

· 4 is the first composite number.

There are some other way of understanding about Prime & Composite number -

Prime & Composite Number,

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