This is the 8398th most frequent Russian word.
мухаммеда
The word "мухаммеда" is a form of the name "Мухаммед" (Muhammad), commonly referring to the Islamic prophet or as a personal name.
Here, "Мухаммеда" is the accusative form of the name 'Мухаммед', showing that Muhammad is the direct object of the verb "пригласили" (was invited).
Мухаммеда пригласили на урок литературы.
Muhammad was invited to the literature class.
"Мухаммеда" is the genitive form of the name 'Мухаммед', indicating possession or association with 'друга' (friend).
Во дворе я встретил друга Мухаммеда.
In the yard, I met Muhammad's friend.
Here, "Мухаммедом" is the instrumental form of the name 'Мухаммед', showing the means or accompaniment with the action 'обменялись' (exchanged).