javalab/P22.java

import java.util.Scanner;

public class P22 {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        System.out.print("Enter an integer: ");
        int n = scanner.nextInt();

        System.out.println(n + " is " + (prime(n) ? "" : "not ") + "a prime number.");

        scanner.close();
    }

    public static boolean prime(int number) {
        if (number <= 1)
            return false;

        for (int i = 2; i <= Math.sqrt(number); i++)
            if (number % i == 0)
                return false;

        return true;
    }
}