The word “information” is an uncountable noun (also called mass noun) in English, just like “smoke” or “rice”. This means that it is treated as a certain kind of “substance” or “matter”, not as an object.
As a result, it does not make sense to say “an information”. You should say, for example:
That's interesting information.
That's an interesting information.
If you want to stress that you are talking about a specific “unit” of information, you can use the word “piece” (just like you would use the word “cup” for rice):
This piece of information is very helpful.
Since it's uncountable, “information” does not have a plural form and is combined with “little” and “much” rather than “few” and “many”:
I have little information about the subject.
I have few informations about the subject.
How much information has been lost?
How many informations have been lost?
When you want to express that you have a small amount of information, the most natural way is to use “some information”. Saying “a little information” is possible but much less common:
I've found some information about him.
I've found a little information about him.
A few more examples:
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