Four is the first composite number. Four and two are good friends. Two times two is four. Two is a factor of four. Two plus two is four. Two squared is four.
For the ancients there were four elements, fire, air, water and earth.
We live in a four dimensional universe that appears to be three dimensional. The is up, down and sideways, or X,Y and Z.
Einstein considered time a fourth component of dimension. Even though we cannot see time we sense know we are moving through time and space.
When you think of the divisibility rules for four just remember fours best friend two. If the last two digits of a number is divisible by four, the entire number is divisible by four.
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