Depends on how you look at it. He is very creative in his musical style, and has a unique sense of lyricism. He has sold a lot of records and won a lot of awards. If that is being a genius, then yes he is.
Kanye West is not a genius as when he was at the airport, someone asked him "What is your job?" for his passport and he wrote down 'creative genius' but spelled genius wrong. Not the exact genius.