225 = 32 x 52.
225 = 152. 225 is the smallest square that starts with two identical digits.
225 is the smallest square whose external digits (25) form a square, and whose internal digits (2) form a prime.
225 is the only three-digit square with all prime digits.
225 has a representation as a sum of two squares: 225 = 92 + 122.
225 is a divisor of 262 - 1.
225 is an octagonal number. It is also a centered octagonal number.
A Scrabble board has 225 squares.Source: Number Gossip
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