mille et milliers

Question

So when does one use mille and milliers de?  Are they interchangeable?

Céline Pickard · Accepted Answer

Bonjour Mike,
That's right. They are interchangeable. You could use both "mille" and "un millier de" as it is mentioned in this lesson: https://french.kwiziq.com/revision/grammar/how-to-express-large-numbers-in-french-such-as-thousands-millions-and-billions-numbers
Bonne journée.