What is a square number that is between 40 and 70?

49+64

a square number is an answer given by 2 numbers that are the same

for example: square numbers between 20-50 would be 25, 36 and 49 because

5x5: 25

6x6: 36

7x7: 49

Therefore they are the only numbers that have 2 of the same numbers multiply.

I tried to explain that as best as possible although it may be very confusing