No, "How" is not a verb .
-It can be used as adjective.
example: How are you ?
-It can be used as anoun that meansby which something is accomplished.
example: l am not interested in the why, but in the how.
-It can be used as a conjunction.
example: l remember how to solve the puzzle.
-It can be used as an adverb.
example: How do you solve this puzzle?