Prophets Were Sent By God
23 And also in the reign of Shule there came prophets among the people, who were sent from the Lord, prophesying that the wickedness and idolatry of the people was bringing a curse upon the land, and they should be destroyed if they did not repent. (Ether 7:23)
Prophets Foretold the Coming of Christ
13 And the Lord God hath sent his holy prophets among all the children of men, to declare these things to every kindred, nation, and tongue, that thereby whosoever should believe that Christ should come, the same might receive remission of their sins, and rejoice with exceedingly great joy, even as though he had already come among them. (Mosiah 3:13)
Prophets Helped Priests and Teachers
11 Wherefore, the prophets, and the priests, and the teachers, did labor diligently, exhorting with all long-suffering the people to diligence; (Jarom 1:11)
Prophets Helped Kings
17 For behold, king Benjamin was a holy man, and he did reign over his people in righteousness; and there were many holy men in the land, and they did speak the word of God with power and with authority; and they did use much sharpness because of the stiffneckedness of the people—
18 Wherefore, with the help of these, king Benjamin, by laboring with all the might of his body and the faculty of his whole soul, and also the prophets, did once more establish peace in the land. (Words of Mormon)
Prophets Were Not
The office of Prophets was not an administrative office, part of a church structure, nor called and confirmed by man.