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Identification of Prime Number

Arvind Kumar
14/05/2019 0 0

 

Step (i) :  Find approximate square root of given number
Step (ii): Divide the given number by prime numbers less then approximately square root of number.     If given number is not number, then it is prime otherwise not .

Ex.1. Is 131 a prime number?

Sol. Approximate square root = 12

Prime number < 12 are 2, 3, 5, 7, 11 But 131 is not divisible by any of these prime number. So 131 is a prime number.

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