According to the BBC:
Data from the petitions website on Thursday evening suggested 1.3m signatures were from people who said they were from the UK, 10,000 from France, nearly 6,000 from Spain and more than 4,000 from Germany, among others.
Don't understand their 1.3m figure when it was over 2m at the time the BBC wrote the article, as it only specifies whether you are a British Citizen or a UK resident on the petition. 700,000+ from outside the UK doesn't seem right to me.
Having said that, even if it is 2m, 8m, or 12m, I don't think it holds much weight at all unless the leave side set one up and theirs doesn't do nearly as well. In isolation this petition can't be listened to. Doesn't indicate anything other than those of us who voted remain still want to do so and have signed the petition.
If it got say 17m legitimate votes then they would have to take notice, but can't see it.
Fairly sure there was one pushing for a no deal Brexit and it mustered around 600,000 votes.

