It is not an aside, since there is nobody else on stage, behindwhose back the words might be said. Nor is it properly speaking asoliloquy, since it is not delivered within the context of theplay. The Prologue is not a character in the play who is deliveringhis perspective on what is going on, but an external observergiving an objective address to the audience. Compare the prologueof Romeo and Juliet with the similar Prologue in Henry V andcontrast it with the soliloquy ( NOT a prologue) which startsRichard III. That soliloquy is given by Richard, one of thecharacters in the play, and it is given in character.