java check if a number is prime number

/**
 * @author lautturi.com
 * Java example:determine whether a number is prime in java
 */

import java.util.*;

public class Lautturi {
	
   public static boolean isPrime(int n) {
        for (int i = 2; i <= Math.sqrt(n); i++)
            if (n % i == 0) return false;
        return n > 1;
    }

	public static void main(String[] args) {

		System.out.println(isPrime(1234));
		System.out.println(isPrime(11));
		
	}
}

output:

false
true