Does the president of the LDS church preside over the whole as a prophet or just the church and its members?

The duty of the President is to preside over the whole Church and to be like unto Moses, to be prophet, D&C 107: 91-92. We believe in prophets, A of F 1: 6.

does God ever call any other men to be prophets over other churches and nations, or not? why?
Update: another typo, i meant to ask whether the prophet/president presides over the "whole earth"
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