No, but it is non-linear.
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Relationship between radius and area of a circle is nonlinear. Area = pi * radius^2, so it is like a quadratic. If you graphed radius on the horizontal, and area on the vertical, it would be a parabola (actually a half of a parabola, since you cannot have a negative radius).
If you mean y = x2, then yes, it is nonlinear.
y=x2 and y=lnx are two examples of nonlinear equations.
Nonlinear scaling is a scaling where the difference between each major unit of measure is not the same. For example, see logarithmic scale.
linear