noun
hundreds of items; a large number of things
Used to emphasize a very large quantity of countable objects. The reading なんびゃっこ is a contraction of なんびゃくこ.
倉庫には何百個もの段ボール箱が積まれている。
Hundreds of cardboard boxes are piled up in the warehouse.
彼は何百個ものビー玉を集めている。
He collects hundreds of marbles.
数百個 also means 'hundreds of items', but 何百個 is more colloquial and emphatic.
Compound of 何 (nan, 'what') + 百 (hyaku, 'hundred') + 個 (ko, counter for small items). The reading なんびゃっこ results from rendaku and contraction.