Are Dementors born or made?

Dementors are born when there is so much pain and suffer in the air that it can materialise it's self. That means that most Dementors were created during the First and Second wizarding war or in the time of Grinwald's attacks in Europe. That's why Dementors can only be destroyed by the Patronum summoning charm.

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Regarding this, can muggles see hogwarts?

No, Muggles aren't able to find Hogwarts. It is hidden from the muggles with spells - even if they wander to that area, the school and the students are not visible to them. Thereof, did dementors used to be human? soulless and evil", which could mean that the Dementors were humans transformed by other Dementors. In respect to that, J.K. Rowling has said that Dementors don't breed, but grow like fungi where there is decay, and are functionally immortal in terms of age.

Correspondingly, why did the dementors try to kiss harry?

The Dementors only target Harry specifically at the end of the book when one Dementor steps away from the rest and decides to give him the kiss due to him getting in the way of capturing Sirius. Lupin says earlier that the kiss is only done by the Dementors to those that "they wish to destroy utterly". Who gave Hermione the time turner? Professor McGonagall Towards the end of Prisoner of Azkaban, Hermione revealed to Harry just how she managed to go to three classes at once. Yes, Ron, Hermione was that good; so good that Professor McGonagall had persuaded the Ministry of Magic to give her a Time-Turner.