Is ten an adverb

No, "ten" is not an adverb. "Ten" is a numeral or a number that represents the quantity of ten. It is an adjective when used to describe a noun (e.g., ten Apples) or a noun when used as the subject or object of a sentence (e.g., I have ten). It does not describe how an action is done, which is the role of an adverb.