Prime Number

What is prime number?

A whole number having only 2 factors is called the prime number.

The two factors of a prime number are 1 and the number itself.

(i) 2 → the factors are 1 and 2.

1 × 2 = 2

2 × 1 = 2


(ii) 3 → the factors are 1 and 3.

1 × 3 = 3

3 × 1 = 3


(iii) 5 → the factors are 1 and 5.

1 × 5 = 5

5 × 1 = 5


(iv) 7 → the factors are 1 and 7.

1 × 7 = 7

7 × 1 = 7


(v) 11 → the factors are 1 and 11.

1 × 11 = 11

11 × 1 = 11


(vi) 13 → the factors are 1 and 13.

1 × 13 = 13

13 × 1 = 13


(v) 17 → the factors are 1 and 17.

1 × 17 = 17

17 × 1 = 17


(vi) 19 → the factors are 1 and 19.

1 × 19 = 19

19 × 1 = 19

Thus 2, 3, 5, 7, 11, 13, 17 and 19 are prime numbers.


Note: (i) All prime numbers except 2, are always odd numbers.

(ii) All prime numbers are exactly divisible by 1 and the number itself.




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