Primates are the mammals that belong to order primate. Primates are divided into two groups which contain prosimians (including lemurs, lorises, galagos and tarsiers) and anthropoids (monkeys and apes - including humans).
These are the certain characteristics of primates:
Unfused and highly mobile radius and ulna in the forelimb and tibia and fibula in the hind,
Comparatively poor sense of smell,
Prehensile five-digit hands and feet possessing flat nails instead of claws
Primate teeth are distinguishable from those of other mammals
The mammals which do not have these characteristics are called non- primates.