Identifying a Prime Number – Simple method

METHOD TO CHECK WHETHER A NUMBER IS A PRIME OR NOT …. ?

PRIME NUMBER : A number is greater than 1 is called a prime number, if it has only two factors, namely 1 and the number itself.

Procedure to find out the prime number:

Suppose A is given number.

Step 1: Find a whole number nearly greater than the square root of A.

K > square root(A)

Step 2: Test whether A is divisible by any prime number less than K. If yes A is not a prime number. If not, A is prime number.

EXAMPLE : 

Find out whether 337 is a prime number or not?

Step 1: 19 > square root (337) Prime numbers less than 19 are 2, 3, 5, 7, 11, 13, 17

(19*19=361 and 18*18=324.So,we need to find a whole number  number greater than the square root of 337.As 324<337<361 we need to take 19)

Step 2: 337 is not divisible by any of them

Therefore 337 is a prime number

Find the prime number:

Pick the composite number :

Identify the prime numbers:

Pick the odd one out ?

Is 599 a prime number ?

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