"Is it true; is it kind, or is it necessary?" -- Socrates,
The Socratic standard (and more) applies to "prophesies", as well.
• First, is the alleged "prophesy" true? This can only be determined once the allegedly prophesied events have occurred. Note, however, that (1) we know of prophesies only after the events they have allegedly foretold, (2) we never seem to hear of the prophesies that did not come true; and (3) most prophesies are so vaguely worded that correlation can be made with practically any event.
• Second, is the alleged "prophesy" kind? Anyone can predict gloom and doom, as such events occur on an almost daily basis. Mass shootings, droughts, pandemics, civil unrest, and celebrity/political scandals have become our backdrop. Hardly any alleged "prophesies" center on blessed events unless those events have already happened.
• Third, is the alleged "prophesy" necessary? If the prophesied events are not likely to directly affect anyone reading about them, then the alleged "prophesies" themselves are irrelevant. If a prophesy is intended as a warning, then it should warn us about events that are likely to happen in the physical world and in the near future. "Spiritual" events, and events that will allegedly happen long after we are gone are irrelevant.
• Fourth, is the alleged "prophesy" helpful? As mentioned before, anyone can predict gloom and doom, but very few prophesies allow for an escape clause -- a prediction that the dire events can be avoided if certain specific actions are taken. And by "specific actions", I do not mean a word salad of vague admonishments to "do better" or "pray more", but specific actions to be taken that will mitigate or prevent the allegedly "prophesied" event.
• Finally, is the alleged "prophesy" worded clearly enough to be understood by everyone who can read? For example, each quatrain of Nostradamus can be interpreted as a prophesy of several different and unrelated events (after they have occurred, of course), while scientific theories can predict recordable physical events with almost total certainty. Prophesies should not need to be interpreted if they are presented in the readers' native language(s).
Once these self-appointed "prophets" start recording their alleged "prophesies" in advance, it becomes easy to determine that their accuracy is no greater than random chance, unless their alleged "prophesies" are so vaguely worded as to apply to almost any situation.