density of multisphere particles

Dear all,
I have a question regarding the density of multi-sphere particles.
The density defined in the input, is the density of each sphere or the density of the pack(including some spheres)?
fix pts1 all particletemplate/multisphere 15485863 atom_type 1 density constant 2500 nspheres 17 ntry 1000000 spheres file data/stone1.multisphere scale 0.001 type 1
For example here the density of the cluster will be 2500?
If we create a cluster with more sphere to make a smoother shape the density of cluster will increase?