Някой ще помогне ли да корегираме моето решение получавам 75/100 точки .

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace PrimeCheker
{
    public class PrimeCheker
    {
        public static void Main()
        {
            ulong number = ulong.Parse(Console.ReadLine());
            ulong count = IsPrime(number);

            if (count == 2)
            {
                Console.WriteLine("True");
            }

            else
            {
                Console.WriteLine("False");
            }
        }

        private static ulong IsPrime(ulong num)
        {
            ulong count = 0;
            for (ulong i = 1; i <= num; i++)
            {
                if (num % i == 0)
                {
                    count++;
                }
            }
            num = count;
            return num;
        }
    }
}