src/PrimeNumberCheck.java

public class PrimeNumberCheck {

	public static void main(String[] args) {

        int n;

        n = 12;

        System.out.print("is ");
        System.out.print(n);
        System.out.print(" prime number ? ");
		System.out.println(isPrime(n));
	}

	public static boolean isPrime(int n) {
		if (n == 0 || n == 1) {
			return false;
		}
		if (n == 2) {
			return true;
		}
		for (int i = 2; i <= n / 2; i++) {
			if (n % i == 0) {
				return false;
			}
		}

		return true;
	}
}