Yes, Satan is the beast. But when Satan comes as the beast he will not look like the Devil. He will look like God.
Very soon Satan and his evil angels will be allowed to inhabit physical, visible bodies. They will visit people and talk to them. They will not appear as hideous demons. They will appear as God and glorious angels from heaven. They will deceive most of the people on earth.
When Satan appears on earth in a beautiful, shining body he will claim that he is God. This is who the beast is. The beast is Satan appearing on earth as a radiant, heavenly being, claiming to be God.
Read on to learn more about who the beast is.