Mathematical Maelström 7 — Don't Think Outside the Square I

by plutoman
www.plutopuzzles.com

A/X is a square
B is a square
C is a square
C+P is a square
D+H is a square
E is a square
F is a square
G is a square
J is a square
2K is a square
L is a square
N is a square
N-M is a square
O is a square
P+S is a square
Q/I is a square
R+2I is a square
R+V is a square
T/7 is a square
U/3 is a square
W is a square
Y is a square
Y-Z is a square
Z/12 is a square

"Across" and "Down" are not specified as each letter only corresponds to one answer.
No number begins with zero.
A calculator could come in handy, as could the list of all three-digit squares below.
Just remember, don't think outside the square!