is a square an adverb or adjective

A square is neither an adverb nor an adjective; it is a noun when referring to the geometric shape with four equal sides and four right angles. However, "square" can also be used as an adjective when describing something that has the shape of a square or when describing something as fair and balanced, as in "a square deal."

Extra: In the context of English grammar, nouns are words that refer to people, places, things, or ideas. For example, "chair," "city," and "happiness" are all nouns. In our case, a "square" (as a noun) is a flat shape with equal sides and every angle being a right angle (90 degrees).

Adjectives, on the other hand, are words that describe or modify nouns. They can tell you about a feature or quality of a noun such as color, size, disposition, number etc. When we use "square" as an adjective as in "square box," we mean the box has the shape of a square.

Adverbs modify verbs, adjectives, or other adverbs. They often tell us how when, where to what extent, or under what conditions something happens. For example, "quickly," "very," and "there" are adverbs. "Square" does not fit into this category because it does not modify how, when, where or to what extent an action is performed.

So, in English grammar, the same word can serve different functions depending on how it is used in a sentence. This is why "square" can be a noun or an adjective, but it is not generally used as an adverb.