(x + 4)2
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-4
The square of a number is the number multiplied by itself. Therefore the square of the number 4 written normally as 42 is = 4*4 = 16. Five more than 42 would therefore be =(4*4)+5 = 21.
4
Every square of a 4 digit number has more than four digits.
The number is 3 or 4.