I'll mark this as resolved.

Create a function that finds the largest palindromic number made from the product of at least 2 of the given arguments.

I already told you how you get the number, it's not using all the arguments. See the last example.

8510158 is greater than 5417145, isn't it?

Why do you think it's an error?

7 * 23 * 32210 = 5185810 and that can be rearranged to 8510158 there is no error.

You most probably have some syntax error, and most probably it's located in a line preceding the if or somewhere around.
You might have too many semicolons, or some mismatched brace, but it's difficult to tell exactly, without seeing your code.