Trinitarian Christianity and Numbers 23:19 - Was Jesus a man?

In a discussion about the trinity, I was asked about Numbers. I was completely stumped. **Numbers 23:19** > God is not a man, that he should lie; neither the son of man, that he > should repent: hath he said, and shall he not do it? or hath he > spoken, and shall he not make it good? "If Numbers says that God is not a man, how can Jesus be God?" Is the question I was presented and I had no answer.