  We prove that the "naive" convolution Dirichlet series D_2(s) attached to a
degree 2 Siegel Hecke cusp form F, has a pole at s=1. As an application, we
write down the asymptotic formula for the partial sums of the squares of the
eigenvalues of $F$ with an explicit error term. Further, as a corollary, we are
able to show that the abscissa of absolute convergence of the (normalized)
spinor zeta function attached to F is s = 1.
