A prostitute in a dream is read symbolically, as trading part of yourself — time, values or affection — for security or approval. Tradition also links it to desire and the wish to be wanted, without judging either.
Has this come up in your dreams before? What was going on in your life then?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.