Certainly not. There is a tremendous energy loss between the levels of the food chain. If you start with plants as 100% energy, something that eats the plant (an herbivore) will burn 90% of that (see diagram in the link). Something that eats the herbivore receives 10% of that energy, which THEY will burn 90% of. By the time a human eats an animal (lets say a cow, which is lower on a food chain than, for example, a tiger), there is still a tremendous energy loss, but still enough to sustain a human.
This is a very compelling reason to eat plants, fruits and nuts in addition to meat. This is also why vegans and vegetarians claim to be so much healthier. Whatever.
Anyway, if you ate a human, you're getting a fraction of a fraction of the energy content, as we're at the top of the food chain. It's also why we don't eat predator animals like wolves or lions. You can't sustain yourself for long with that kind of diet.