Sure,
you just have to be able to prove your identity (beyond any doubt the migration service might present), have a clean criminal record and lived here for 4 or 5 years.

If you are sentenced the period is prolonged. If you have debts the period may be prolonged.

I guess the immigrants are not only criminal but also so lazy that they can not be bothered to commit the crimes they came here to commit until suddenly 4 or 5 years has passed and a swedish citizenship comes flying (after they filled in the forms, payed the fees, proved their identity)?

So how long would you want people to wait?

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