So what? Do you believe all humans are apes?
Apes are not taxon classifications of superfamily (Hominoidea, "apes"), family (Hominidae, "great apes"), subfamily (Homininae, "African apes"), tribe (Hominini), but not that of genus (Homo, "humans") or species (Homo sapiens, "wise humans", for the anatomical modern humans).
The superfamily Hominoidea ("apes") is a superfamily of the order Primates, and Primates of the class Mammalia ("mammals").
So yes, the current subspecies Homo sapiens sapiens belonged to both Homo ("humans") and Hominidae ("great apes"), as well as being among many primates, and that of mammals.
Mammalia are one of classes that fall under the phylum Chordata (eg having notochord & the spinal cords that are covered by vertebrae) and that phylum falls under the kingdom Animalia.
So not only humans are mammals, we are vertebrates (that would include fishes, amphibians, reptiles & birds). We are also -
- tetrapods (having 4 limbs) and
- amniotes (animals that reproduce embryos, and the fetuses grow inside female wombs before birth (eg most mammals) or animals that lay their fertilized eggs (zygotes) on dry lands, eg reptiles and birds).)
Are we not mammals? tetrapods? vertebrates? ainimals?