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**__Jan Jay:__**
Take a look at this:

9 X 9 = 81

+1 -1 **-1**

10 X 8 = 80

+1 -1 **-3**

11 X 7 = 77

+1 -1 **-5**

12 X 6 = 72

+1 -1 **-7** 13 X 5 = 65 . ..

This pattern goes on and on even on negative numbers. As you notice the difference of the numbers goes: -1, -3, -5, -7... . When the sum of the two numbers is even (9+9=18), the difference between the numbers is odd. When the sum of the two numbers is odd(9+8=17), the difference between the numbers is even.

Take a prime number (7) Square it (49) What you will get is a prime square number (PSN).

A PSN is a number which is only divisable by its square root. It works for all prime numbers.

Can you find any OTHER divisor in these totals?

13 X 13 = 169 29 X 29 = 841 37 X 37 = 1369 41 X 41 = 1681 59 X 59 = 3481

Let me know if there are other divisors and I will prove this wrong.