Your routing number is a combination of your institution number and transit number, with a 0 added in front of the institution number. This format is specifically required by traditional Canadian banks when processing domestic wire (SWIFT) payments to other Canadian banks.
For example, if your institution number is 621 and your transit number is 20002, your routing number would be 062120002 (where 0 is added in front of the institution number).
However, even if you provide your routing number along with your account number (which starts with 5xxxxxxxxxxx), you will only be able to receive EFT (Electronic Funds Transfer) payments, not Wire (SWIFT) payments.
Since EFT and Wire (SWIFT) payments are not the same, you must provide your Wire (SWIFT) details (which are different from your routing number) if someone wants to send you a Wire (SWIFT) payment.