i) Place thirteen different three-digit prime numbers in the empty cells of this grid.
ii) Now place thirteen different three-digit square numbers in the empty cells of this grid.
How many solutions are there of each instance?
Source: https://www.amazon.com/-/es/Bernardo-Recam%C3%A1n/dp/048684241X
Numbers are to be read as in a crossword: across or down.