Prime Number in Java

 

Prime number in Java

 

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What is a prime number ?

A prime number is a number that is greater than 1 and has only two factors: 1 and the number itself.

That means, if you divide the number by any number other than 1 or the number itself, the remainder will not be zero.

 

For example:

2, 3, 5, 7, 11, 13

 

package testing;

 

public class TestPrimeNumber {

 

     public static void main(String[] args) {

        

         int givenNum = 12;

         boolean isPrimeNumber = true ;

        

         for(int i=2; i<givenNum; i++) {

             

              if(givenNum % 2 == 0) {

                  isPrimeNumber = false ;

                  break ;

              }

         }       

         System.out.println("Is the given num a prime number ? "+isPrimeNumber) ;

     }

}

 

Output :

givenNum = 12;

Is the given num a prime number ? false 

givenNum = 11;

Is the given num a prime number ? true