See my drawing below for answer!
When finding the prime factors of a number try using a prime factor tree (like the drawing)
Start with your chosen number, in this case 1 million. you could then either divide this by 2 or 5, or any prime number. Keep repeating this process, dividing by 2 or 5 each time. When you finally get down to a low enough number, so that you cannot divide any more. Circle all of the prime numbers on your tree. Count these up, for example if you have 3 twos and 2 fives you would write 2³ x 5² as your final answer.
Hope this helps :)