PrimeNumbers.java

import java.util.Scanner;

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 // Java Program to check Prime Number
 
public class PrimeNumbers {
    
	public static void main(String args[]) {
        
		boolean isPrimeValue = true;
		
		// create Scanner class object to get input from user
        Scanner scanner = new Scanner(System.in);
		
        System.out.println("Enter a number:");
		
        //get user's enetered value from 'scanner' object into 'num' variable
        int num = scanner.nextInt();
		
		int halfNum = num / 2;		
      
        if (num == 0 || num == 1) {
            System.out.println(num + " is not a prime number");
        } else {
            for (int i = 2; i <= halfNum; i++) {
                if (num % i == 0) {
                    System.out.println(num + " is not a prime number");
                    isPrimeValue = false;
                    break;
                }
            }
            if (isPrimeValue) {
                System.out.println(num + " is a prime number");
            }
        } 
    }
}