Unlikely. You can first try to call that specific number to see if it is in service.
If not in service, the number may be available. Which telephone company did you have that number with? Each mobile company has their own pool of cell phone numbers to choose from. Once a number is given up, the number goes back to original telecom company.
So unless the number was from Public mobile, you probably can't get that number back.
A little clarification....if you originally got your number from telus, koodo or pm you have a very small chance of getting it back if it is not currently reassigned.
You can always spend some time looking at available phone numbers in the the change number feature in your self serve account. You will presented with 6 options choose another local calling area for another 6. Find the calling area that is offering both the same area code (first 3 digits) and exchange (second 3 digits) then keep looking for the last 4 digits that come closest to your old number. If your old number is not currently in use you might luck out and find it.
New or recycled phone numbers are released each morning so you could make this your new coffee ritual. You can now change your number up to 4 times per 30 days so if you find something close you could take that number but continue to search each day for your golden egg!