Can I love you without a calculator?

Use a calculator. I obviously do not understand English.

$the\quad value\quad of\quad e\quad is\quad 2.718\\ so,\quad 2.718\times 980=\quad 2663.916\\ now,\quad \sqrt { 2663.916 } =51.613\\ hence,\quad answer\quad is\quad 128\times 51.613=6606.46$

this person don't want us to use a calculator, but it does not stop us from using pen and paper...it however took three turns to get to correct answer

$128\sqrt{e*980}=128\sqrt{e*2^2*5*7^2}=128*14\sqrt{e*5}=1792\sqrt{e*5}$

at which point we can approximate e =2.718 then use guess &check method to approximate square root

$\approx 1792\sqrt{2.718*5}=1792*sqrt(13.59)\approx 1792*3.685=6603.5$ and checking with calculator $1792\sqrt{e*5}=6606.48$

I really don't know is there any solution for this without using a calculator?

Plugging this equation into a calculator gives the value 6606.48188... which should round up to 6606.5, no?

For anyone still doing those here is the solution I entered : 6528 (and got correct, I know it's not the right value but it's an honest approximation to me). $\newline$ How I got to that number : $\newline$ $e \approx 2.7 = 27/10 \newline 980 \times e \approx 27 \times 98 ~= 27 \times 100 = 3 \times 9 \times 100 \newline sqrt(e980) \approx 3 \times 10 \times sqrt(3) = 30 \times sqrt(3)\newline sqrt(3) \approx 1.7\newline 30 * 128 = 3840\newline 128sqrt(e980) \approx 128 * 30 * 1.7 = 6528 \newline$ Sorry about any bad presentation, I'm not used to do this.