if the corporation has been dissolved, the number no longer represents a legal entity, so no. Unless somehow he's re-registered with the same number as a sole proprietership, but why would you do that ? Or if the number represents a holding or management company above the dissolved corporation, then it makes perfect sense.
While the business formerly carried on by the numbered company may be closed, the numbered company itself may still be in good standing as an Ontario corporation - and therefore still able to operate. If you want to check the status of an Ontario corporation, go to the Ministry of Consumer and Business Services, Companies and Personal Property Security Branch, at 200 - 393 University Avenue.