μήπως (= whether/ if) is used only in questions in direct or indirect speech.
Ex.
Μήπως έχεις ώρα; = Do you have the time? (direct question)
Με ρωτάει μήπως έχω ώρα. = He asks me if I have the time. (indirect question)
ίσως (= perhaps / maybe) is used in statements.
Ex.
Ίσως έρθω αύριο το πρωί. (= Perhaps I come tomorrow morning)
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Vasiliki Baskou, Instructor/Director, https://learn-greek-online.com.