PrimeNumber.java

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/**
 *
 * @author DELL
 */
public class PrimeNumber 
{
    public static void main(String[] args)
    {
        int i,m=0,flag=0;
        int n=3;//it is the number to be checked 
        m=n/2;
        if (n==0||n==1){
            System.out.println(n+" is not prime number");
        }else{
            for(i=2;i<=m;i++){
                if(n%i==0){
                    System.out.println(n+" is not prime number");
                    flag=1;
                    break;
                }
            }
            if (flag==0) { System.out.println(n+" is prime number"); }
        }
    }
}