No, the Witcher books are not a series of short stories. They are interconnected novels, meaning that each novel builds on the events of the previous one and the events in one often influence later books. The Witcher saga consists of seven books in total - The Last Wish, Sword of Destiny, Blood of Elves, Time of Contempt, Baptism of Fire, The Swallow’s Tower, and Lady of the Lake. However, each book does have several short stories within them, so there is some semblance of a series of short stories if taken in that context.
