Ten Million
noun
You already know that 一千 is "one thousand," and that 万 is "ten thousand." Add all those zeros together (or multiply 1,000 with 10,000) and you end up with ten million.
You learned that 千 is the more common and default way to say 1,000 and 一千 is sometimes used for emphasis or clarity. Well, to say ten million, you almost always say it as 一千万. I mean, who wouldn't want to emphasize ten million! It's ten million, you know?
You already learned how to read both 一千 and 万, so just put those two readings together and you're good to go!
一千万ドルがほしいなぁ。
I wish I had ten million dollars.
ロトで一千万円ゲットしたんだ！
I won ten million yen in the lottery!
コンサートには一千万人の人がきました。
Ten million people came to the concert.