Check if a numbe is a prime number in java

/**
 * @author lautturi.com
 * Java example: Prime Number Program in Java
 */

import java.util.*;

public class Lautturi {

	public static void main(String[] args) {

		int i, m = 0, flag = 0;
		int number = 5;// the number to be checked
		m = number / 2;
		if (number == 0 || number == 1) {
			System.out.println(number + " is not prime number");
		} else {
			for (i = 2; i <= m; i++) {
				if (number % i == 0) {
					System.out.println(number + " is not prime number");
					flag = 1;
					break;
				}
			}
		}
		if (flag == 0) {
			System.out.println(number + " is prime number");
		}

	}
}

output:

5 is a prime number