A novice question

I am interested in politics- not joining, of course,  but following – to some extent, that is.

Have a fair idea of ministries and ministers, and have indulged in some ‘Basic’ level of lunchroom discussions around politics with colleagues. But that is about all. 

Here is a ‘Beginner Level’ question on the working of our Parliament – Since our PM is not an MP (Lok Sabha) does he ever come to the House and indulge in debates. I am assuming he should be. So can a non-MP enter the House?