If you leave the settings for file numbering at their default: i.e. continuous numbering and not resetting with a new card, and do not manually reset the numbering, or low-level format your card, then the number in the file name in the form ###-#### should be the shutter count. That usually starts at 100-0001 and will go to 100-9999 then start at 101-0001 again (i.e. a counter reset every 10k).
cheers, TREVOR
Before you ask us, have you looked in the manual or on the Canon Support Site?
"All the variety, all the charm, all the beauty of life is made up of light and shadow", Leo Tolstoy;
"Skill in photography is acquired by practice and not by purchase" Percy W. Harris
