Zero is a real number, it is neither positive or negative, and it is even.
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The unique nonnegative square root of a nonnegative real number. For example, the principal square root of 9 is 3, although both -3 and 3 are square roots of 9.
An integer is a whole number. Nonnegative mean not negative. A nonnegative integer is a whole number that is not a negative number. For example, 0, 1, 2, 3, 4, 5,....
The first four consecutive nonnegative integers. One-hundred and twenty-three with a leading zero.
A non-zero real number! In set notation, it may be represented as R \ {0}.
No. Not if the second number is zero.