@Adam Bing,
A simple bit of copy-paste just to spice up the pot.
1. There are several mundane ways in which a prediction of the future can be fulfilled:
1. Retrodiction. The "prophecy" can be written or modified after the events fulfilling it have already occurred.
2. Vagueness. The prophecy can be worded in such a way that people can interpret any outcome as a fulfillment. Nostradomus's prophecies are all of this type. Vagueness works particularly well when people are religiously motivated to believe the prophecies.
3. Inevitability. The prophecy can predict something that is almost sure to happen, such as the collapse of a city. Since nothing lasts forever, the city is sure to fall someday. If it has not, it can be said that according to prophecy, it will.
4. Denial. One can claim that the fulfilling events occurred even if they have not. Or, more commonly, one can forget that the prophecy was ever made.
5. Self-fulfillment. A person can act deliberately to satisfy a known prophecy.
There are no prophecies in the Bible that cannot easily fit into one or more of those categories.
2. In biblical times, prophecies were not simply predictions. They were warnings of what could or would happen if things did not change. They were meant to influence people's behavior. If the people heeded the prophecy, the events would not come to pass; Jonah 3 gives an example. A fulfilled prophecy was a failed prophecy, because it meant people did not heed the warning.
3. The Bible also contains failed prophecies, in the sense that things God said would happen did not (Skeptic's Annotated Bible n.d.). For example:
* Joshua said that God would, without fail, drive out the Jebusites and Canaanites, among others (Josh. 3:9-10). But those tribes were not driven out (Josh. 15:63, 17:12-13).
* Ezekiel said Egypt would be made an uninhabited wasteland for forty years (29:10-14), and Nebuchadrezzar would plunder it (29:19-20). Neither happened.
4. Other religions claim many fulfilled prophecies, too (Prophecy Fulfilled n.d.).
5. Divinity is not shown by miracles. The Bible itself says true prophecies may come elsewhere than from God (Deut. 13:1-3), as may other miracles (Exod. 7:22, Matt. 4:8). Some people say that to focus on proofs is to miss the whole point of faith (John 20:29).