Did mohammed write the Quran?

If Mohammed invented it all, then who actually wrote the Quran? Some parts of the Quran undeniably feel divinely inspired, while others do seem more human in nature. What fascinates me is how he managed to create a book that continues to astonish people to this day. Can anyone share evidence or theories about where he might have drawn his ideas or inspiration from?

Edit: I know Mohammed didn’t write the Quran, as he was illiterate, but recited or whatever he did with “God’s words”