Java Code To Check Given Number Is Prime Number or Not

Program:

public class Prime 
{
	public static void main(String args[]) 
	{
		int num = 29;
		boolean flag = false;
		for (int i = 2; i <= num / 2; i++) 
		{
			if (num % i == 0) 
			{
				flag = true;
				break;
			}
		}
		if (!flag)
			System.out.println(num + " is a prime number.");
		else
			System.out.println(num + " is not a prime number.");

	}
}

Compile:

javac Prime.java
java  Prime

Output:

29 is a prime number.