What are Prime Numbers? 

In math, prime numbers are whole numbers greater than 1, that have only two factors – 1 and the number itself.

Prime numbers are divisible only by the number 1 or itself.  

 For example, 2, 3, 5, 7 and 11 are the first few prime numbers.



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Program Listing

// Prime_Number.java
// Jake Rodriguez Pomperada,MAED-IT, MIT
// www.jakerpomperada.blogspot.com  and www.jakerpomperada.com
// jakerpomperada@gmail.com
// Bacolod City, Negros Occidental Philippines

import java.util.Scanner;

public class Prime_Number {

    public static void main(String[] args) {

        Scanner scan = new Scanner(System.in);
        System.out.print("\tPrime Number Checker in Java Using BlueJ ");
        System.out.print("\tEnter a Number : ");
        int num = scan.nextInt();
        boolean flag = false;
        for(int i = 2; i <= num/2; ++i)
            if(num % i == 0)
                flag = true;

        if (!flag)
            System.out.println("\t" + num + " is a prime number.");
            System.out.println("\t" + num + " is not a prime number.");