Yes, that's correct.  The real part is -5, and the 6 is the imaginary part.

The following is quoted from Wikipedia:


"Although other notations can be used, complex numbers are very often written
in the form



where a and b are real numbers, and i is the imaginary unit, which has the
property . The real number a is called the real part of the
complex number, and the real number b is the imaginary part."