I'm no expert, but have seen many posts regarding this one. If you simply want an indication of whether it's used a trace with SQL profiler is a simple option.
You could get the full MDX statement, user, cube, execution time etc
Hassle is it's the full mdx statement, cumbersome to break up into measures, dimensions.
But it's a start.
However it might become a bit intensive if you just let it run without thought on how the trace would affect your production environment...