num = int(input("请输入一个数字: "))

质数大于 1

if num > 1:

查看因子

for i in range(2,num): (不懂)

       if (num % i) == 0:
           print(num,"不是质数")
           print(i,"乘于",num//i,"是",num)
           break
   else:
       print(num,"是质数")

如果输入的数字小于或等于 1，不是质数

else:
   print(num,"不是质数")