Donald Trump is NOT Time magazine's Person of the Year ... the honor should go to Colin Kaepernick -- that's according to rap star Killer Mike, who says Kaep's a leader and Trump's an "entertainer."
We got Mike out in ATL ... and he told TMZ Sports he gets why Trump's in the running ... but at the same time, POTUS can't hold a candle to Colin.
"We like entertainers. Donald Trump is a successful entrepreneur but essentially he's an entertainer."
Mike says Kaep's an entertainer too in the sense that he's a pro athlete .