Yes.
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Yes, zero is considered a number. It represents the absence or lack of quantity. It is often used as a placeholder and has its own mathematical properties and operations.
Yes.
Zero is not considered a prime number because it does not have any factors other than itself, which is a prerequisite for a number to be considered prime. Additionally, zero is not considered a composite number because it does not have more than one factor, which is another requirement for a number to be classified as composite. Zero is a special case and is treated as its own separate category.
Yes, it is considered a number. In the past, people had difficulties accepting zero as a number, but nowadays it is universally accepted as such.
There is no first number above 0. If x was considered to be the first number above zero then x/2 would be above zero but nearer to it. And then half that number would be above zero and nearer still. And so on.
It is possible to divide 0 by any number that is not zero because it is just zero of that number, like 1/7 is one seventh of one, 0/7 is zero sevenths of one. You can not divide any number by zero, however. 7/0 is considered undefined.