Answer:
63
Step-by-step explanation:
The other numbers are squares.
5 x 5 = 25
4 x 4 = 16
7 x 7 = 49
9 x 9 = 81
A square number or perfect square is an integer that is the square of an integer; in other words, it is the product of some integer with itself.
Answer: 63
Step-by-step explanation: Unlike the others the square root of 63 is not a whole number. 25 is 5, 16 is 4, 49 is 7, and 81 is 9.
