No, it is not a preposition. The word playground is a noun.
If you take out the prepositional phrase, the sentence will still make sense. A prepositional phrase contains a preposition, a noun, and usually an article or other adjective. "The little children raced around the playground." If you take out "around the playground", the sentence would still make sense. The word "around" is the preposition and "playground" is the noun that is the object of the preposition. Therefore, "around the playground" is the prepositional phrase in this sentence.
It's a preposition. The words "to the playground" make up a prepositional phrase.
The preposition is around.
In this instance, to is a preposition indicating movement or an action or condition suggesting movement toward a person, place or thing.
The Playground Kidders are the playground kidders
Either can be correct, depending on its use in a sentence: "Mel and I are at the playground" or "She found Mel and me at the playground."
Trash and old playground items to be replaced by new playground items.
The noun playground is a countable noun. Singular: playground Plural: playgrounds
playground equipment
A playground has no fixed size
It depends what playground it is; they can be various sizes.
No, then is not a preposition. It is a conjuction.Than is a preposition.