Answer Posted / Jitendra Kumar Paswan

Here's a simple C# program to check if a number is prime:

using System;

namespace PrimeNumberChecker
{
class Program
{
static void Main(string[] args)
{
Console.Write("Enter a number: ");
int num = Convert.ToInt32(Console.ReadLine());

if (IsPrime(num))
Console.WriteLine(num + " is prime");
else
Console.WriteLine(num + " is not prime");
}

static bool IsPrime(int num)
{
if (num <= 1) return false;
for (int i = 2; i < Math.Sqrt(num); i++)
if (num % i == 0) return false;
return true;
}
}
}

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