'Six' in the Bible

Each of the four living creatures had six wings and were full of eyes inside and out. Without stopping day or night they were saying, "Holy, holy, holy is the Lord God Almighty, who was, who is, and who is coming."

In this case wisdom is needed: Let the person who has understanding calculate the total of the beast, since it is a human multitude, and the sum of the multitude is 600, 60 and six.