It is just fecal matter which is undigested food waste.
there is nitrogen and phosphorus
no, more
pick it up
Clean it off.
Wont eat or talk. Or poop.
Both male and Female guinea pigs sometimes eat their droppings. the reason is that their poop contains minerals that are helpful to the guinea pig.
THIS IS TRUE! they are trying to poop but the poop wont come out.
Either leave it, it should come off in the sawdust or wood shavings, whatever is in your guinea-pig's cage, or, you can pick up the guinea-pig and flick it or pick it off.
Because it doesn't really care as long as it is reasonably dry and warm.
its either you fed it to much or it has a disease
probably not but he should be dewormed now.
Most likely
a guinea pigs poop should only be the size of a baby's middle fingernail. if its bigger thasn that, take it to the vet.