Command addressed just to the prophet

[Elena]

Peace.
A question, please.

Extracted from Free-minds article on Poligamy

" It is worth noting that the marriages of prophet Muhammed (known through the Quran) were commanded by God(3337, 3350) and that these commands were uniquely addressed to him 3350"These marriages had social, political and educational purposes, and there was an additional condition with them he was not allowed to divorce his wives"

Does The Quran say more about this? The reasons of the permission/duty specifically for the prophet?