传智博客黑马程序员视频-基础第40课

刚开始学，什么都不懂，高手不要骂我，   传至博客黑马程序员C#基础第四十节课第一题习题的代码，有什么不对，还望大家多多指点~

题目：判断一个数是否为质数.

        static void Main(string[] args)
        {
             string receive;
             do
             {
                 Console.WriteLine("请输入一个数:");
                 receive = Console.ReadLine();
                try
                {
                    int number = Convert.ToInt32(receive);
                    if (number <= 0 || number == 1)
                    {
                        Console.WriteLine("请输入大于1的数字！");
                        continue;
                    }
                    bool input = ZhiShu(number);
                    if (input == false)
                    {
                        Console.WriteLine("是质数");
                    }
                    else {
                        Console.WriteLine("不是质数");
                    }
                 }
                 catch 
                 {
                    if (receive != "q") 
                    {
                        Console.WriteLine("数值非法!");
                    }
                 }

             } while (receive != "q");
        }
        public static bool ZhiShu(int number) 
        {
            for (int i = 2; i < number; i++) 
            {
                if (number % i==0) 
                {
                    return false;
                }
            }
            return true;
        }