Can a ticket buyer win more than one prize?

Yes, if the ticket buyer has purchased more than one ticket in the raffle, it is possible for the ticket buyer to win more than one prize in the raffle. 

For example, if the ticket buyer has purchased 10 tickets in a raffle, they will have 10 chances to win a prize. If one of their tickets wins a prize, only that winning ticket number will be removed from the draw. The ticket buyer will still have 9 more chances to win one or more of the remaining prizes.