Is the word with a preposition?

Answer 1

Yes, it is a preposition.
A preposition is a word that combines with either a pronoun or a noun to have an adjectival relation.

Answer 2

Yes, a preposition is a word that typically comes before a noun or pronoun and shows the relationship between that noun or pronoun and other words in a sentence. Examples of prepositions include: in, on, at, to, from, etc.