Prime.java

/* Write a program for checking if the given number is prime */

import java.util.Scanner;

class Prime{
	public static void main(String[] args) {
		
		Scanner sc = new Scanner(System.in);

		System.out.print("Enter a number: ");
		int n = sc.nextInt();

        boolean isPrime = true;

        if (n <= 1) {
            isPrime = false;
        } else {
            for (int i = 2; i <= Math.sqrt(n); i++) {
                if (n % i == 0) {
                    isPrime = false;
                    break;
                }
            }
        }

        if (isPrime) {
            System.out.println(n + " is a prime number.");
        } else {
            System.out.println(n + " is not a prime number.");
        }

	}
}