将一个正整数分解质因数。例如：输入90，打印出90=2*3*3*5-A quality factor decomposition of positive integer. For example: enter 90, print out the 90 = 2* 3* 3* 5

你只需要输入一个大于2的数，就能自动判断这个数是否是素数，如果不是素数就自动分解质因数。 -you only need to import a few of the more than 2, will automatically judge whether the number is prime, prime, if not automatically decomposition quality factor.