No zeros occur in this puzzle.
A: B down multiplied with H across.
D: A across + F down.
E: a prime number.
G: a cubic number.
H: take E across, subtract one from each digit, and the result is H across.
I: the first digit equals the digit sum of A across, while the second digit equals the digit sum of F down.
K: A across multiplied with the product of all digits of H across.
M: the greatest common divisor of M across and L down is greater than H across.
A: has the same digit sum as G across.
B: the digit sum of H across multiplied with H across.
C: a palindrome.
D: G across squared.
F: this square number equals H across multiplied with G across.
J: the reverse of L down.
K: a prime number.
L: E across multiplied with the digit sum of H across.