Good thread. The Scriptures give numerous tests or identifying marks of a prophet:
Test Number 1: Deuteronomy 18:21-22:
"And if thou say in thine heart, How shall we know the word which the Lord hath not spoken? When a prophet speaketh in the name of the Lord, if the thing follow not, nor come to pass, that is the thing which the Lord hath not spoken, but the prophet hath spoken it presumptuously: thou shalt not be afraid of him."
Test Number 2: Numbers 12:6
"And he said, hear now my words: if there be a prophet among you, I the Lord will make myself known unto him in a vision, and will speak unto him in a dream."
Test Number 3: Numbers 24:4 & 16
"He hath said, which heard the words of God, which saw the vision of the Almighty, falling into a trance, but having his eyes open...He hath said, which heard the words of God, and knew the knowledge of the most High, which saw the vision of the Almighty, falling into a trance, but having his eyes open:"
Test Number 4: Daniel 10:17
"For how can the servant of this my lord talk with this my lord? for as for me, straightway there remained no strength in me, neither is there breath left in me."
Test Number 5: Daniel 10:18
"Then there came again and touched me one like the appearance of a man, and he strengthened me."
Test Number 6: Jeremiah 28:9
"The prophet which prophesieth of peace, when the word of the prophet shall come to pass, then shall the prophet be known, that the Lord hath truly sent him."
Test Number 7: 2 Peter 1:20
"Knowing this first, that no prophecy of the scripture is of any private interpretation."
Test Number 8: 2 Peter 1:21
"For the prophecy came not in old time by the will of man: but holy men of God spake as they were moved by the Holy Ghost."
Test Number 9: 1 Corinthians 14:3
"But he that prophesieth speaketh unto men to edification, and exhortation, and comfort."
Test Number 10: Isaiah 8:19-20
"And when they shall say unto you, Seek unto them that have familiar spirits, and unto wizards that peep, and that mutter: should not a people seek unto their God? for the living to the dead? To the law and to the testimony: if they speak not according to this word, it is because there is no light in them."
Test Number 11: 1 John 4:1-3
"Beloved, believe not every spirit, but try the spirits whether they, are of God: because many false prophets are gone out into the world. Hereby know ye the Spirit of God: Every spirit that confesseth that Jesus Christ is come in the flesh is of God: And every spirit that confesseth not that Jesus Christ is come in the flesh is not of God: and this is that spirit of antichrist, whereof ye have heard that it should come; and even now already is in the world."
Test Number 12: Matthew 7:15-16
"Beware of false prophets, which come to you in sheep's clothing, but inwardly they are ravening wolves. Ye shall know them by their fruits. . ."