Pls explain why 50 isn't a perfect square number

The closest square to 50 is 49 ,I.e. 7x7=49 and 8x8 = 64, 50 is between 49 and 64.

A perfect square number is given by a product of two equal integers (numbers).

Theorically, the perfect square is a number multiplied by itself.

9 is a perfect square because it can be written as 3*3

400 is a perfect square that can be written as 20*20

50 can't be written as a product of two equal integers.

It would be 7.07106*7.07106