A biblical prophet is primarily a spokesperson for God — one who speaks God's word to his people. Prediction of the future is secondary to this primary function. Scripture gives specific tests for false prophets (Deuteronomy 18:20-22, 13:1-5). Whether the prophetic office continues in the same form today is a genuinely disputed question between cessationists and continuationists. 85/100 Spiritually Safe — the biblical definition is clear; contemporary applications are disputed.
The most common misconception about biblical prophets is that they were primarily future-predictors. They were not — primarily. The Hebrew word nabi (prophet) is related to the verb "to speak" or "to call." A prophet was fundamentally a spokesperson for God — one who delivered God's message to his people in their present circumstances.
The classic definition appears in God's description to Moses of Aaron as prophet: "You shall speak to him and put the words in his mouth, and I will be with your mouth and with his mouth... he shall be your mouth, and you shall be as God to him" (Exodus 4:15-16). Aaron was Moses's prophet — his spokesman. The New Testament equivalent is Paul's description in 1 Corinthians 14:3: "The one who prophesies speaks to people for their upbuilding and encouragement and consolation."
Prophets did predict the future — and specific, detailed fulfillment was one of Scripture's tests for genuine prophecy. Isaiah 46:9-10 — "I am God, and there is no other; I am God, and there is none like me, declaring the end from the beginning." Isaiah predicted the Babylonian exile 150 years before it happened; Micah 5:2 predicted the Messiah would be born in Bethlehem. New Testament prophecy includes prediction (Acts 11:27-28, 21:10-11).
But prediction was always in service of the primary function — calling God's people to faithfulness, covenant loyalty, and repentance. The Old Testament prophets were less interested in timeline charts than in whether Israel was trusting God and treating the poor justly.
Scripture gives specific tests: Deuteronomy 18:20-22 — if a prophet speaks in the name of the LORD and the predicted thing does not happen, the prophet has spoken presumptuously. False prophets whose predictions fail are false prophets. Deuteronomy 13:1-5 — even if a sign or wonder comes true, if the prophet leads people away from the LORD, he is a false prophet. Theological content matters alongside accuracy.
This is a genuinely disputed question between cessationists (the prophetic office ceased with the apostolic age and the completion of the New Testament canon) and continuationists (the prophetic gifts continue today, though with different function than the biblical canon-producing prophets). Both positions are held by serious Christians and this is a disputable matter. See our Theology hub and our guide on Is Speaking in Tongues for Today? The Gospel Coalition on the prophetic office and GotQuestions on prophets today present the debate fairly.