What you are looking at is a two pole 100 amp breaker. Distribution panels in North America are designed to use 120/240 volts. Any two adjacent breakers will give you a 240 volt circuit and either leg to the neutral will give you 120 volts.
On the main breaker of a panel the number stated on the breaker is the amount of amperage that the breaker will allow to pass before tripping regardless of which leg the current passes through.
A 200 amp service will have a two pole main breaker with a rating stating its capacity of 200 amps.
Wire size into the breaker will give you a good clue as 100 amp breakers will use a #3 conductor whereas a 200 amp breaker will be fed with a 3/0 conductor.
No it does not mean you have a 200 amp service. you should / could possibly have a "main" breaker. That breaker size is your service size.
The meter is typically installed in the main circuit panel of the house. If you want to move it, you can do it as part of a service / panel upgrade. We did this when we moved into our new house - we replaced the 1950s vintage main circuit panel and 100A service with a newer 200A panel and service. It was about a grand, but we didn't actually move the panel from where it was, so it may cost more for what you want.
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