The princes were not sent as teachers themselves, but had the duty committed to them of seeing that the people were taught. The actual teachers were the priests and Levites of 2 Chronicles 17:8.
Related Commentaries of 2 Chronicles 17:7
2 Chronicles 17:7
7 Also in the third year of his reign he sent to his princes, even to Benhail, and to Obadiah, and to Zechariah, and to Nethaneel, and to Michaiah, to teach in the cities of Judah.