He is a mean and greedy man who often does business with the Romans. Appears in Asterix and the Cauldron when he tries to trick the Gauls into paying his taxes for him, though by the end he has lost the money he regained.
This is normal. Your credit score could change daily depending on how often your credit report is updated. Your creditors and lenders are continuously making updates to your credit report throughout the month. Each time you check your credit score, it's recalculated based on the information in your credit report.
Without incurring any fees, you can do this every four months, rotating through each reporting bureau every year. If you know that your spending is under control, and you have few fears about ruining your own credit, it only makes sense to check your credit this way: three times a year, every four months.