Question 278741
{{{720/2=360/2=180/2=90/2=45}}}
Since 45 is not divisible by 2, then you stop.
{{{720=2^4*45}}}
Now continue with 45 and division by 3.
{{{45/3=15/3=5}}}
Since 5 is not divisible by 3, then you stop.
{{{720=2^4*3^2*5}}}
Now continue with 5, although it's obvious.
{{{5/5=1}}}
{{{ 720=2^4*3^2*5^1 }}}