The end of the universe itself?

Back to the end of the universe: can a millimeter large black hole destroy the earth instantly? Or would it slowly eat up the Earth?

A Black Hole that small would be a Primordial Black Hole.
Black Hole Names and Sizes.
"However, if theoretical Hawking radiation does not actually exist, such primordial black holes would be extremely difficult, if not impossible, to detect in space due to their small size and lack of large gravitational influence."

A Hole that small wouldn't be able to suck in the Earth because it lacks the mass, and thus Gravity, to do so. If it gained more mass, it would become larger than a CM or so in diameter. :/

 Spoiler

If someone here knows what they're talking about, please correct me where need be since everything I know is self learned, and not very... extensive. XP