Integer squares between 45 and 70 are 49 and 64 only. 4+9=13 so the number (integer) is 49.
7.92=62.41 and 6+2+4+1=13 so 62.41 is a perfect square between 45 and 70. The question asks for a number, and numbers include mixed numbers (containing a decimal fraction).
So we have two numbers 49 and 62.41.