The correct phrasing is 2 mice, not 2 mouse, because mouse and mice follow an irregular plural pattern in English. Mouse is singular referring to one small rodent or one computer pointing device, while mice is the plural form referring to two or more. So you would say I saw one mouse in the kitchen and I saw two mice in the kitchen. The confusion sometimes arises because some people think you add an s to make a plural, but for mouse the plural is not mouses in standard usage for the animal, although mouses is occasionally used informally for computer mice, even though many style guides still prefer computer mice as well. So the phrase 2 mice is grammatically correct, while 2 mouse is incorrect. If you are counting, you would say one mouse, two mice, three mice, many mice. The same irregular pattern appears in other words like louse and lice, goose and geese. So if you are writing a sentence, always write I caught 2 mice in traps last night, not I caught 2 mouse. For formal writing, it is better to write out the number as two mice rather than 2 mice, but both are understood and the plural form remains mice either way.
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