PrimeChecker

gistfile1.java

import java.util.Scanner;

public class Main {

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

        System.out.println("Enter a number to check if it's prime:");
        int possiblePrime = scanner.nextInt();

        boolean isPrime = true;
        for (int i = 2; i < possiblePrime; i++) {
            int remainder = possiblePrime % i;
            if (remainder == 0) {
                isPrime = false;
                break;
            }
        }

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

    }
}