When the number comes after the name of the book, it’s referring to the chapter.
Just in case you run for President someday. :)
I don’t know how it was originally written. It wasn’t even written with the Roman Numeral II. It was written in Hebrew and Aramaic.
Second Corinthians in Hebrew
×§×•×¨×™× ×ª×™×× ×¡ ×”×©× ×™
Corinthians Two in Hebrew
דו ×§×•×¨×™× ×ª×™×× ×¡