"Watch our for false prophets. They come to you in sheep's clothing, but inwardly they are ferocious wolves. By their fruit you will recognize them. Do people pick grapes from thornbushes, or figs from thistles? Likewise every good tree bears good fruit, but a bad tree bears bad fruit. A good tree cannot bear bad fruit, and a bad tree cannot bear good fruit. Every tree that does not bear good fruit is cut down and thrown into the fire. Thus, by their fruit you will recognize them." Matthew 7:15-20
First off, know this: not all prophets are true prophets. There were false prophets in Jesus' time, and there are false prophets now. The devil masquerades as an angel of light. It would be great if the good guys looked pretty and the bad guys looked ugly, but most of the time they look the same to our physical eyes. So how do we tell them apart?
By their fruit. By all that one says and does. However, this isn't as easy as is sounds. Anyone is capable of bearing "good fruit" for a season or "bad fruit" for a season. Determining whether a prophet (in using prophet, I don't mean an Old Testament prophet type of person, but anyone who claims to know God) is true or false is by watching their life.
Do not put your faith in men, but in Christ, and let His words determine whether you should walk alongside others in your followship.
May the Spirit in you help you determine whether your prophets are true or false. If they are false, may you deal with them in a manner which honors Christ. If they are true, may you walk alongside them, seeking life in Christ.