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Prophecy means much more than foretelling the future. When Peter says 2 Peter 1:19 that we have a more sure word of prophecy, he is referring to the whole counsel of God as revealed in the entire Bible.
Vine's Dictionary of New Testament Words defines Prophecy as "the speaking forth of the mind and counsel of God.... The verb to prophesy describes the function of the true prophet as he speaks God's message to the people, under the influence of the divine spirit."
Here are links to useful information on this subject:
Bible Prophecy: www.thisisyourbible.com/library/show/154
The Evidence of Bible Prophecy: www.thisisyourbible.com/library/show/1032
I hope you have found this helpful.