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How do you read 100000 in French?
Write 100000 in French words.
How Do You Spell 100000 in French?
In most use cases, there would be no ambiguity. The context will generally rule out the strictly correct option if you talk about prices or actual quantities :
Cette maison coûte un million deux.
Cannot mean but €1.2M in France, same with :
Il y a trois million huit habitants dans cette ville (= 3.8M inhabitants).
Un million un sounds a little odd, un million cent is more common to mean 1.1M.
Same for Un million dix to Un million quatre-vingt-dix neuf, they might be too rarely used, if ever, to deserve being mentioned.
When you really want to tell 1 000 001, you certainly can use un million et un but with something to qualify last "one":
Un million et un habitant.
Un million et deux Euros.
Un million et quatre unités.
One can also say the unambiguous :
Pile (ou exactement) un million plus un habitant.
The correct way to say 1 000 001 in French is indeed "un million un". I do hear sometimes "un million un" for 1 100 000. It may come from "1.1 millions". It is incorrect and as we say in French it is "un abus de langage".
To be sure people understand what I meant, I would say "un million-et-un".
1 000 000 : "millionième", 1 000 001 : "million-et-unième"