Is the word to a preposition?

Answer 1

It is often a preposition.

(he went to the store).

But it can also form the infinitive of a verb, where the combined form can be a noun, adjective or adverb.

(he likes to play football)

(he needs a dog to pet)

(he went to see the play)

Answer 2

The word "to" can function as a preposition in certain contexts, such as indicating direction or destination, as in "I'm going to the store." However, it can also serve as part of an infinitive verb form, such as "to run" or "to eat." In those cases, it is not considered a preposition.