No, it isn't an adverb. The word hasn't is a contraction of "has not" which includes a helper verb and the adverb "not."
Adverb
It can be an adverb or an adjective.
adverb
No, you is a pronoun not and adverb as its is defining a noun Adverb adds more to a verb like he is walking *fast*
No. Easier is an adjective. The adverb form is easily.
it hasnt
hasnt
He hasnt.
he hasnt
it hasnt
he hasnt
it hasnt
she hasnt yet ;)
No he hasnt.
it hasnt
no she hasnt
no he hasnt he plays for argentina