Is 1613 a noun if used in prepositional phrase?

No, "1613" is not a noun when used in a prepositional phrase. It's a number, and numbers are not nouns.

Here's why:

* Nouns are words that name people, places, things, or ideas.

* Prepositional phrases are groups of words that begin with a preposition (like "in", "on", "at", "to", "from", etc.) and end with a noun or pronoun.

For example, in the phrase "in 1613," "1613" is part of the prepositional phrase, but it's not the object of the preposition. The prepositional phrase itself functions as an adverbial phrase modifying the verb, telling us when something happened.

Let me know if you'd like another example or have any other questions about grammar!