(2X^-2 * y^3)^4 * 2x^19 * y^6

(2X^-2 * y^3)^4 * 2x^19 * y^6

So we have

2^4 * (x^-2)^4 * (y^3)^4 * 2x^19 * y^6      remember ..  (a^m)^n  = a ^(m *n)

16 * x ^-8 * y^12 *2x^19 * y^6   rearrange

(16*2 ) * ( x^-8 * x^19) * (y^12 * y^6)       and  a^m * a^n = a^(m + n)

32*x^11*y^18

it simplifies to a number

No it does not simplify to a number!

Thanks for the help