The term 'microwave' is both a noun and a verb, for example:
*You can put this in the microwave (noun)
*You should microwave (verb) it.
You could also ask if it's possible to microwave the product,
'Is this microwaveable?'
'No, don't microwave that.'
「microwave」は動詞としても名詞としても使われます。
例：
〔名詞〕You can put this in the microwave.（レンジでチンできます）
〔動詞〕You should microwave it.（レンジでチンした方がいいです）
電子レンジで加熱できるか聞くこともできます：
'Is this microwaveable?'
（レンジで加熱できますか）
'No, don't microwave that.'
（いいえ、できません）
Microwave is a special word that can be used as a noun and as a verb. As can be seen in phrase 1, it was used as a verb while in phrase 2 it was used as a noun.
Both phrases can be used and are correct in any setting whether it is formal or informal.
Hope this helps!
The first example sentence is an open question and the listener my respond by telling you how to cook this item (be it by microwave or otherwise). This type of question is probably more useful than the closed question form of the second example - which only prolongs the conversation unnecessarily.
Microwavable - Able to be cooked or heated in the microwave.
-Can this be cooked in the microwave?
-Do I cook this in the microwave?
-How should I cook this dish?
Microwavable - 電子レンジで加熱、調理できる
-Can this be cooked in the microwave?（これは電子レンジで調理できますか）
-Do I cook this in the microwave?（これは電子レンジで調理するのですか）
-How should I cook this dish?（この料理はどう調理するのですか）
"Do I use the microwave?"
Is a question used when asking, usually about food, how something is cooked, ex. "How do I cook this? Do I use the microwave?"
The term 'Microwavable' is the word for the product that is cooked by using the microwave.
"Do I use the microwave?"（電子レンジを使いますか）
は、普通食べ物についてどのように調理するか尋ねるときに使われます。
例：
"How do I cook this? Do I use the microwave?"（これはどのように調理しますか、電子レンジを使いますか）
'Microwavable'（電子レンジで使える）は、電子レンジで調理する食品を表します。
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