The IsVectorField(v) command returns true if v is a vector field (that is, if v was created by a call to the VectorField command), and false otherwise.

$\mathrm{with}\left(\mathrm{Student}\left[\mathrm{VectorCalculus}\right]\right)\:$

$v≔\mathrm{VectorField}\left(⟨r^2\,\frac{\mathrm{\theta }}{r}⟩\,\mathrm{polar}\left[r,\mathrm{\theta }\right]\right)$

$\mathrm{IsVectorField}\left(v\right)$

$\mathrm{true}$