It is a natural number, an integer, a perfect square, a perfect fourth power, a rational number, a real number, ... and so on.
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Square root of -1 is an imaginary number (√-1 = i), √-16 = √-1 * √16 √-16 = i * 4 √-16 = 4 i
7/16 is a number - expressed as a fraction or a rational number.7/16 is a number - expressed as a fraction or a rational number.7/16 is a number - expressed as a fraction or a rational number.7/16 is a number - expressed as a fraction or a rational number.
The number of possible combinations is 2^4=16. Depending on what you're representing, this could be positive integers (0 to 16), positive and negative (-8 to 7), or some kind of floating point... Depends on what you mean (But whatever kind of numbers you mean, there are still 16 of them.)
16 in number words = sixteen
All multiples of 16, which is an infinite number.