Yes some gram books say it’s not and some say it is. I will do some more research. Inshaa Allah.
I am looking for some text where I can actually see how it is used.
Jazak Allah khayr.
If you have some info please send it to me.
Waalikum mussalam , it is both usages.
As preposition it means “like ” انت كأخي (it will come before ism)
كَ can comes as pronoun of nasb or jarr as رَبُّكَ، اُحبُّكَ . (after ism or fil)
Happy Land 
Assalamu Alaikum Wa Rahmatullah.
I got doubt whether ك is among prepositions or pronoun.
Waalaykumassalaam wa rahmatullah
Yes some gram books say it’s not and some say it is. I will do some more research. Inshaa Allah.
I am looking for some text where I can actually see how it is used.
Jazak Allah khayr.
If you have some info please send it to me.
Masalaam
Waalikum mussalam , it is both usages.
As preposition it means “like ” انت كأخي (it will come before ism)
كَ can comes as pronoun of nasb or jarr as رَبُّكَ، اُحبُّكَ . (after ism or fil)