The Books of the Prophets in the Bible are divided into two (2) groups Four (4) Major. Prophets : Isaiah, Jeremiah, Ezekiel, Daniel and twelve (12)Minor Prophets: Hosea, Joel, Amos, Obadiah, Jonah, Micah, Nahum, Habakkuk, Zephaniah, Haggai, Zechariah, and Malachi. The Books of the Major Prophets are not more important they are only longer.
Most of the minor prophets preached during the times of the kings of Israel and Judah. They each authored the Book of the Bible which is named after them.