  We consider the question of when a Jacobian of a curve of genus $2g$ admits a
$(2,2)$-isogeny to two polarized dimension $g$ abelian varieties. We find that
one of them must be a Jacobian itself and, if the associated curve is
hyperelliptic, so is the other.
  For $g=2$ this allows us to describe $(2,2)$-decomposable genus $4$ Jacobians
in terms of Prym varieties. We describe the locus of such genus $4$ curves in
terms of the geometry of the Igusa quartic threefold. We also explain how our
characterization relates to Prym varieties of unramified double covers of plane
quartic curves, and we describe this Prym map in terms of $6$ and $7$ points in
$\mathbb{P}^3$.
  We also investigate which genus $4$ Jacobians admit a $2$-isogeny to the
square of a genus $2$ Jacobian and give a full description of the hyperelliptic
ones. While most of the families we find are of the expected dimension $1$, we
also find a family of unexpectedly high dimension~$2$.
