Q. 1 What is Prime Number?
Answer :  A prime number (or a prime) is a natural number greater than 1 that has no positive divisors other than 1 and itself.Â
Q. 2 Write a programmer in C# to check number is prime or not ?
Answer : The following code snippet to check prime number or not.
using System;
namespace PrimeNumber
{
class Program  Â
 {
static void Main(string[] args) Â Â Â Â
   {
private static int Check_Prime(int number)
      {
Console.WriteLine("Enter a number");
int number = Convert.ToInt32(Console.ReadLine());
int result = Check_Prime(number);
if (result == 0)
{
Console.WriteLine("{0} is not a prime number", number); Â Â Â Â Â Â Â Â Â Â
} else         Â
  {
Console.WriteLine("{0} is a prime number", number);           Â
}Â Â Â Â Â Â Â Â Â Â Â
Console.Read();
}Â
int i;
for (i = 2; i <= number - 1; i++)
           {
if (number % i == 0)
      {
return 0;
        }
     }
if (i == number)
           {
return 1;
           }
return 0;
       }
   }Â
}