Whether is not a
question word
An interrogative word or question word is a function word used to ask a question, such as what, which, when, where, who, whom, whose, why, whether and how. They are sometimes called wh-words, because in English most of them start with wh- (compare Five Ws).
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How do you use whether in a question?
Use whether, but not if, immediately before 'or not': The question is whether or not the government has the right to interfere. Whether is generally preferred when 'or' appears later in the sentence, but you can also use if: It is not clear whether/if the information was stolen or deliberately leaked to the press.
What type of word is whether?
Whether is a conjunction.