For all practical purposes, yes. In the strictest technical sense it's a form of JIT compilation, but that can be considered an optimization or implementation technique. If the user doesn't perceive a separate compilation step, it's effectively an interpreter and only a dedicated pedant would "well actually" that it's compilation.

Not really. An interpreter doesn't convert the language syntax tree into machine code, instead it just performs the operations. It sounds like Swift's REPL actually converts the lines into opcodes and runs those.