noun, の adjective
The ordinal number prefix two chapter has a much simpler way of describing it, which is chapter two.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
Chapter one was good, but two was meh.
This is gonna be the second chapter of your life, yeah?
No way! Are you reading that book too? I’ve just finished chapter two. Don’t tell me anything if you’re farther than me.