Is this write code to chck prime num?if wrong plz tell m bst

Question

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

namespace PrimeNumber

{

class Math

{

static void Main(string[] args)

{

Console.WriteLine("Enter a Number : ");

try

{

int num = int.Parse(Console.ReadLine());

if (num == 2 || num == 3 || num == 5 || num == 7)

{

Console.WriteLine("Entered number is Prime number");

}

else if (num % 2 != 0 && num % 3 != 0 && num % 5 != 0 && num % 7 != 0)

{

Console.WriteLine("Entered number is prime number");

}

else

{

Console.WriteLine("Entered number is not prime");

}

}

catch(Exception ee)

{

Console.WriteLine("Exception Raised Please Enter the valid number",ee);

}

Console.ReadLine();

}

}

}