millions

[cat's_eyes]

Dear teaches,
Could you please tell me, which form is correct?

they meet several millions of their clients once a year
OR
several million

I'll be really grateful for your help.

[The French]

Dear teaches,
Could you please tell me, which form is correct?

they meet several millions of their clients once a year
OR
several million

I'll be really grateful for your help.

Hello, I am not a teacher,

But I think it's better to write 'millions' with the 's'. You have 'several' and naturally there are at least two millions.

Have a nice day.

[cat's_eyes]

Thank you:) I'll wait for a teacher anyway:)

[amin zaini]

Hello sir,
"several" is used with a countable name,and it means a some things between 2-9,this is the first point to bear in mind.
since it is used with a countable noun it should be in plural form,so millons is the correct form.

[Barb_D]

I would use the singular.

They had a party for a few hundred of their closest friends.
Four score and seven years ago.

(It is possible to meet with 2,000,000 people in one year?)

[xpert]

Dear teaches,
Could you please tell me, which form is correct?

they meet several millions of their clients once a year
OR
several million

I'll be really grateful for your help.

English, like some other languages, treats large numerals as nouns (cf. "there were ten soldiers" and "there were a hundred soldiers"). Thus, dozens is preferred to tens, while hundreds and thousands are also completely acceptable.

Plurals of numbers differ according to how they are used. The following rules apply to dozen, score, hundred, thousand, million, and similar terms:

* When modified by a number, the plural is not inflected, that is, has no -s added. Hence one hundred, two hundred, etc. For vaguer large numbers, one may say several hundred or many hundreds.
* When used alone, or followed by a prepositional phrase, the plural is inflected: dozens of complaints, scores of people. However, either complaints by the dozen or complaints by the dozens is acceptable (although differing in meaning).

* The preposition of is used when speaking of nonspecific items identified by pronouns: two hundred of these, three dozen of those. The of is not used for a number of specific items: three hundred oriental rugs. However, if the pronoun is included with the specific item, the of is used: five million of those dollar bills.


Source: here

[Soup]

Dear teaches,
Could you please tell me, which form is correct?

they meet several millions of their clients once a year
OR
several million

I'll be really grateful for your help.

From Merriam-Webster's Learner's Dictionary

a/one/two million (of them) ▪ several million (of them) = (less commonly) several millions (of them) ▪ hundreds of millions (of them)

[cat's_eyes]

Thank you very much, this area is quite problematic for me as a non-native, thus I'm going to think about your remarks for a bit longer.
Thank you again.