For positional place value purposes.
Consider this!
The Ancient Romans didn't have a zero. It was a Greek invention which was taken up by the Arabs and is how we got the number zero today.
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No. A negative number is a number below zero, not zero itself.The number zero is neither negative nor positive.
Zero is both.
Yes. Every integer is a factor of zero. Zero is in fact the only number that can be divided by zero, so zero is also a factor. Zero has an infinite number of factors.
Zero is a an integer and, since all integers are real numbers, zero is a real number.
Zero is the only scuh number.