You will know them (prophets) by their fruit (characteristics):
A good tree (true prophet) produces good fruit (spirituality - operates in the will of God). A bad tree (false prophet) produces bad fruit (carnality - caters to the will of man).
CHARACTERISTICS
Bad Fruit: Greed, deception, popularity, immorality, pride, seek followers for themselves. God’s Word is twisted to justify injustice and wrongdoing. The most significant characteristic of a false prophet is that they are liars. Hence, "false prophet." These behaviors define them, making them false prophets by Jesus’ standards. When you heed the instructions of a false prophet, you only honor them.
Good Fruit: Devoted to God, honesty, integrity, loyal in carrying out...