编写一个判断一个数字是否是素数的函数，利用该函数求200以内的素数之和。（素数指除了1和它本身之外，该数没有其他因子，例如101就是一个素数。）-Write a judge whether a number is prime function, using the function evaluation within 200 prime numbers. (In addition to a prime number, and it refers to itself, not the number