Folkeregisteropplysningene er riktige.

Because Norwegian usually writes compound nouns as one word, where English often uses two or more words.

So:

• folkeregister = population register / national registry
• opplysningene = the information / the details

Together, folkeregisteropplysningene means something like the population-register details.

This is very normal in Norwegian. Writing it as separate words would usually look wrong.

A useful breakdown is:

• folkeregister = population register / National Registry
• opplysning = piece of information, detail
• opplysninger = pieces of information, details
• opplysningene = the details / the information

So the whole word is built around opplysningene, and folkeregister- tells you what kind of details they are.

The main noun, or head, is opplysningene. That is why the whole compound is plural and definite.

-ene is the definite plural ending.

For this noun:

• en opplysning = a piece of information / a detail
• opplysninger = details / pieces of information
• opplysningene = the details / the information

So folkeregisteropplysningene means the registry details/information, not just registry details in general.

Because the subject is plural.

The adjective riktig changes to match number:

• Opplysningen er riktig = The detail is correct
• Opplysningene er riktige = The details are correct

Here, folkeregisteropplysningene is plural, so the adjective becomes riktige.

Because Norwegian often puts the at the end of the noun instead of using a separate article.

So:

• opplysninger = details
• opplysningene = the details

That means folkeregisteropplysningene already includes the idea of the.

A separate determiner such as de is used when an adjective comes before the noun:

• de riktige folkeregisteropplysningene = the correct registry details

But in your sentence, the adjective comes after er, so no extra de is needed:

• Folkeregisteropplysningene er riktige.

Because Norwegian often uses opplysninger in places where English prefers information, especially in official or administrative language.

So opplysninger can often be translated as:

• information
• details
• particulars
• data

Even though information is usually uncountable in English, Norwegian often treats this idea as plural, especially when talking about personal details, registered data, or form entries.

Yes, it sounds fairly official or administrative.

You might see it in contexts like:

• government forms
• tax records
• registry confirmations
• digital self-service portals

In everyday speech, people might say something a bit less compact, such as:

• Opplysningene i Folkeregisteret er riktige.
• Informasjonen i Folkeregisteret er riktig.

Your original sentence is completely natural, but it has a slightly formal, institutional feel.

Because Norwegian does not capitalize common nouns the way German does.

So normally:

• folkeregister = lower-case
• opplysninger = lower-case

Even if English might write something like National Registry, Norwegian often keeps words lower-case unless they are part of a proper name in that specific context.

Inside compounds, lower-case is especially normal, so folkeregisteropplysningene looks right.

You move the verb to the first position:

• Er folkeregisteropplysningene riktige? = Are the registry details correct?

This is a very common Norwegian pattern:

• statement: Opplysningene er riktige.
• question: Er opplysningene riktige?

The singular version would be:

• Folkeregisteropplysningen er riktig.

But this is less common, because people often talk about several registered details together rather than one single item.

The pattern is:

• folkeregisteropplysningen = the registry detail
• folkeregisteropplysningene = the registry details

And the adjective changes too:

• singular: riktig
• plural: riktige