I need direct answer. This is about functions and imaginary numbers

Question

Is i^2 a real number? True or False?

Is f(x) = √2, a constant function or a radical function?

Answer 1

Is i^2 a real number? True or False? i² = -1, -1 is a real number. This is TRUE

Is f(x) = √2, a constant function or a radical function? This is a radical function. Example of a constant function would be f(x)=5