No they do not. When I first came to Canada before getting my PR card, they did not stamp my passport, nor did they after I got the PR.
Sam
Really ! did they not stamp it at all ! even to show the port of entry where you have entered, and the date of entry along with the expiry date of your temporary status before you become a PR !
After you got the PR visa, and landed at the port of entry, haven't they stamped your passport as well to show the entry date, and the Code of the port of entry along with the name of it !
The 2 above situations happend to me in both cases, they stamped my passport when i first arrived to canada as an international student at the airport, and when i landed in the borders between canada and the states.