1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23![]()
![]()
.
 
A number MULTIPLIED by itself
is a "SQUARE"
 | 
Multiplying anything with an even makes the result EVEN;
        
 
| 
 | 
| Bram Stoker | 
|---|
Two odds add up to an EVEN 
(and so do two evens);
| 
 |