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It depends on where you live. Lantana, like many plants, is perennial in the south - zones 11, 10, 9, sometimes 8. Farther north the winters are too cold, and lantana is grown as an annual, or a houseplant if you have mucho light. Here's some more info on lantana: https://www.gardeningknowhow.com/ornamental/flowers/lantana/lantana-plants.htm
Also, this is why it is helpful to know the USDA hardiness zone in which you live -- makes selecting plants much easier. This site explains more about the zones, and helps you locate your own: https://www.gardeningknowhow.com/planting-zones/virginia-planting-zones.htm

When plants don't produce flowers, the most likely reasons are too little light, or too much nitrogen. (I'm assuming there are plenty of nice green leaves.) Since from what you describe, they should have enough light, you could try increasing the phosphorous to counteract the possibility of too much nitrogen. Working some bone meal into the soil might be helpful. Also using a pine needle mulch could raise the acidity a bit. If you still don't get flowers, try different varieties, or different plant, next season. Here are a couple of articles that you might find informative: https://www.gardeningknowhow.com/ornamental/flowers/lantana/lantana-plants.htm
https://www.gardeningknowhow.com/ornamental/bulbs/dahlia/tips-dahlia-planting.htm

Since it sounds like your lantana is growing vigorously, you should be able to dig it up and divide it. Water well the day before, and dig it up early in the morning, so it's nice and moist. Take as much of the root as you can, and if the plant is large, you'll need to cut back the foliage. Here's some more information: https://www.gardeningknowhow.com/garden-how-to/propagation/propgen/dividing-plants.htm
https://www.gardeningknowhow.com/plant-problems/environmental/learn-how-to-avoid-and-repair-transplant-shock-in-plants.htm

Since these plants can be grown successfully in containers, I do not see any reason why you couldn't overwinter them indoors. I would drop off the watering to only once monthly and trim it back before bringing it in as well.

If you can move plants at least 4 weeks before cold weather sets in, you can transplant in the fall.
Otherwise, best to wait till early spring, while it is still cool. This article may be useful when its time to move the plant: https://www.gardeningknowhow.com/plant-problems/environmental/learn-how-to-avoid-and-repair-transplant-shock-in-plants.htm

The key to knowing if a plant will survive the winter in your area is to know what hardiness zone you live in. Check out this link to learn about USDA hardiness zones: https://www.gardeningknowhow.com/planting-zones/usda-planting-zone-map.htm
Lantana is generally not winter hardy north of zone 9, or at the least zone 8. Some varieties die back in winter and return in spring. They do seem to respond well to being overwintered indoors, though. You can dig it up, and overwinter in a pot. Be sure to cut back the foliage at least 1/3 - 1/2. Some people put it in a cool basement and barely water; others keep in a sunny spot as a houseplant.