-3.77 is a rational number
============
By definition, a rational number is any number that can be expressed as a fraction where the numerator and denominator are both integers and the denominator is not zero.
In the case of -3.77, it can be expressed as -377/100, where -377 is the numerator and 100 is the denominator.
Both are integers, and the denominator is not zero, therefore -3.77 qualifies as a rational number.