A true, verifiable prophecy should be:
- Specific - applicable to one and only one unambiguous fulfillment. The moment a prophecy is vague enough to be applicable to any one of a number of events then it suspiciously reeks of the "cold reading" tactic used by psychics.
- Not a likely event that one can reasonably guess would happen. For example, if you throw a ball in the air then you can't claim as a prophecy, your prediction that it will fall to the ground. Likewise predicting there would be wars in the future is not a prophecy - it's common sense.
- Must be proven to have been written before the predicted event rather than being a historical report dishonestly written as if its a prophecy.
It also bears noting that the NT's claims of prophecies fulfilled by Jesus carry no weight as there's no way to actually verify that the things written in the NT actually occurred. The NT gospel accounts could be fictional or highly embellished with the writers falsely claiming that Jesus did x in fulfillment of such and such scripture in the OT. Without proof that the claims of the NT are true, none of the supposed OT prophecies claimed to have been fulfilled by Jesus have any weight.
Also when one objectively reads some of the supposed OT prophecies claimed to have been fulfilled by Jesus, it becomes apparent they weren't actually prophecies at all. NT writers twisted obscure OT passages that had absolutely no prophetic significance whatsoever and made them out to be prophecies fulfilled by Jesus.