It is best to assume that Satan knew that Jesus is the Son of God. Possible meanings are 1) this is a temptation to do miracles for Jesus's own benefit. Alternate translation: "You are the Son of God, so you can command" or 2) this is a challenge or accusation. Alternate translation: "Prove that you are the Son of God by commanding"
You could translate this with a direct quotation. Alternate translation: "say to these stones, 'Become bread.'" (See: [[rc://en/ta/man/jit/figs-quotations]])