Sentence examples for not is from inspiring English sources

No, "not is" is not correct and is not usable in written English.
The correct form is "is not." "Not is" is a non-standard word order and can make a sentence sound awkward. Example: "John is not going to school today." This sentence is correct and means that John will not attend school today. Incorrect example: "Not is John going to school today." This sentence is not correct and would not be used in written English. It may be used in informal spoken English or in a question form with a verb before the subject, such as "Is John not going to school today?".