Function IsPrimeTarea Learn programming C#

using System;
public class exercise111
{
    public static bool IsPrime(int n)
    {
        for (int i = 2; i < n; i++)
            if (n % i == 0)
                return false;

        return true;
    }

    public static void Main()
    {
        if (IsPrime(127))
            Console.WriteLine("127 is a prime number");
        else
            Console.WriteLine("127 is NOT a prime number");

        if (IsPrime(1000003))
            Console.WriteLine("1000003 is a prime number");
        else
            Console.WriteLine("1000003 is NOT a prime number");
    }
}