What numbers are plural nouns?

Plural nouns refer to more than one person, place, thing, or idea. In English, plural nouns are typically formed by adding an "s" or "es" to the singular form (e.g., "cat" becomes "cats," "box" becomes "boxes"). Some nouns have irregular plural forms, such as "child" becoming "children" or "mouse" becoming "mice." Additionally, collective nouns can represent groups but are often treated as singular (e.g., "team" or "herd").