Translation:Who is it?
1: I'm not sure anyone would ever ask it about themselves... But Technically yes. 2: Totally! Mini edit expanding on #1: In order to make it more clear, you'd probably want to say 私（わたし）は誰（だれ）ですか because as I stated in the original part of the message, I don't think people really tend to use 「誰ですか」to mean "who am I" very often.