How do you translate the "nan" in "kore wa nan desu ka" from rōmaji to kanji?
Is "これわなんですか" correct?
First of all, the writing system you are refering to is
kanji. And no, it would not be これわなんですか。
The correct way to write it would be this:
The only real difference here is that the は character, pronounced "ha" normally, is being used as a subject particle in this sentence. So is therefore pronounced "wa" and written as "wa" in Romaji.
Another example is the word こんにちは (konnichiwa) which uses the "ha" character as a "wa", but in this case is not a subject marker.
Seperated into seperate words, your sentence is this:
Hiragana: これ は なん です か
So your sentence literally means: What is this?
If you are looking for
kanji and not
hiragana, then the correct symbol would be this:
*: wa being used as the subject particle.
**: です（desu) does not always mean "is"
***: ka is a question marker, making the sentence a question.
何 can be read nan or nani and it means "what".
"kore wa" means "this" and "desuka" indicates a question.
So "kore wa nan desu ka" basically means "What is this?"
In hiragana, これはなんですか。なん is 何 in kanji.
"何" You can read nani, nan. that means what.
"korewa 〜 desuka" means Is this. (If Japanese sentence has desuka, it is Question)
Anyway, "kore wa nandeska" means What's this?