Is "Insects (from Latin insectum, a calque of Greek [entomon], "cut into sections") are a class of invertebrates within the arthropod phylum that have a chitinous exoskeleton, a three-part body (head, thorax and abdomen), three pairs of jointed legs, compound eyes and one pair of antennae." a good answer to the question "How many parts comprise the body of an insect?"
yes