(Philippians 2:7) He was the only perfect man that has ever lived on earth, except Adam.

He was not part human and part spirit being, because "he was made a little lower than the angels for the suffering of death".

Angels are spirit beings, and thus creatures that are lower than angels are human beings.
He was human.

Had he been part God and part man he would have been higher than the angels instead of lower, for the reason that angels are the lowest order of spirit beings.
[214]Being a perfect man, he had the power to produce a perfect race of people and with these populate the earth; therefore in every respect exactly corresponding to the perfect man Adam in the condition he was in while in Eden.

He was perfect in every respect, full of grace and truth.
(John 1:14) When he stood before Pilate, silent as a sheep is dumb before its shearers, when the mob incited by the Jewish clergy of that time were demanding his life blood, Pilate, in order that he might shame the Jews for such action, cried out unto them: "Behold _the_ man".