why do i have silverfish insects?

I moved into my house the day before xmas. and i have seen 4 silverfish. Is this a bad thing. i kill them when i see them and i read up on them to see what damage they do but i got two different responses. can anyone tell me why i have them and if they will hurt me or damage my home. oh yeah and how do i get rid of them.

Update:

when i say i have seen 4, i mean since i moved in.

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