Explanation 26x26 magic square
The 26x26 magic square is double odd (2x13 is double prime number). Double prime number magic squares have an irregular structure. That's why a pure panmagic, symmetric and/or compact 26x26 square does not exist. To get 26x26 magic squares you need to puzzle. Most magic 26x26 square is concentric.
Methods to construct the 26x26 magic square are: