Why is 7 prime?

In other words, why is prime prime? Some magical thoughts will follow.

Let us consider 8. 8 has two factors: 4x2=8. Why is 4x2 = 8? This is not a question in Formal Systems. I consider and agree the system is fine and think why only these factors.

Why does group of four in group of two make a group of eight? What does group of four mean?

will continue....