Micah lived about 2750 years ago, in about 750 BC, during the time of Isaiah. He lived in a small town (Moresheth) south of Jerusalem. He was a contemporary of Isaiah, but it is not known if the two had ever met.
Micah predicted the downfall of Jerusalem and the destruction of the Temple, which were fulfilled by the Babylonian destruction of Jerusalem and the Temple in about 586 BC and again by the Romans in 70 AD. The Temple has not been rebuilt since that destruction. Jerusalem was destroyed a second time by the Romans in about 135 AD.
Micah has a handful of famous prophecies including the coming of the Messiah (5:2-4), and that the humble little town of Bethlehem, not Jerusalem, would be the birthplace of the Messiah.
Micah, means "Who is like Yah?" implying "there is none like Yah". Micah was the first prophet to foresee Jerusalem's destruction as a punishment for the city's sins against the Lord. "Zion shall be plowed as a field, Jerusalem shall become heaps of ruins, and the Temple Mount a shrine in the forest" (Micah 3:12).
The Bible's book of Micah is the sixth of the books of the twelve minor prophets.