Program to check whether the number is prime or not in java

Program to check whether the number is prime or not in java. In the Java programming language, you can choose whether to program in prime or not prime mode. For new learn beginners in the java programming language, this tutorial will show you how to verify if a number is a prime number or not in a java program. A single-digit number and 1 (e.g. 2, 3, 5, 7, 11)

public class Main 
{
public static void main(String[] args) 
{
int num = 100;
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");
}
}

Output:

100 is not a prime number