A credit score of 600 is not really bad since credit scores start at 300 which is really bad,
But if you have a credit score of 630 or below then it'll be harder to get a loan without having a cosigner and you'll likely pay an interest rate of around 6%.
Since your credit score is 600 you might be able to qualify for a loan for up to $3,000.00 but if your credit score is lower than 600 then most lenders won't even consider the loan without a cosigner.