C# Program to Check Whether a Number is Prime or Not

In this C# program, we will take input from the user and check whether the number is prime or not. A prime number is a positive integer that is divisible only by 1 and itself.

 

private static void Main(string[] args)
       {
           Console.ForegroundColor= ConsoleColor.Yellow;
           int num;
           bool Is_Prime_Number = true;
           Console.WriteLine("Enter the Number to check Prime: ");
           num = int.Parse(Console.ReadLine());
           for (int i = 2; i <= num / 2; i++)
           {
               if (num % i == 0)
               {
                   Console.WriteLine("Number is not Prime.");
                   Is_Prime_Number = false;
                   break;
               }
           }
           if (Is_Prime_Number == true)
           Console.WriteLine("Number is Prime.");
           Console.ReadKey();
       }

 

C# Program to Check Whether a Number is Prime or Not Output:

C# Program to Check Whether a Number is Prime or Not

C# Program to Check Whether a Number is Prime or Not

 
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