No, readers do not receive a public notification that they have won a drawing. This is to allow administrators the ability to re-run drawings or replace winners, if necessary, and to notify winners on their own timeline.
In the administrator view, a "Drawing Wins" section appears on a reader's profile page when that person has won a raffle/drawing. The reader does not get notified of this; it is only accessible with administrative access. If the reader has been notified of their prize in another way and come in to claim it, branch staff may mark the prize as having been claimed in this section.