Hyperbole is a <u>literary device</u> that employs the usage of exaggeration to drive home the point being made or allured to; it must never be taken literally.
From the excerpt (second and fourth line), we see the answer to the question:
In line 2 "The crown upon your brows may flourish long", Wheatley expressed her desire to see the king reign for a long time. Line 4 "O may your sceptre num'rous nations sway" is Wheatley hoping and desiring the king conquer and take over more territories and nations.
<u>As such, we see Wheatley uses hyperbole to show the success she wishes for the king</u>
