No, milk is not a good source of fiber.
Fiber is primarily found in plant-based foods like fruits, vegetables, whole grains, and legumes. Milk, being an animal product, does not naturally contain fiber. It's composed mainly of water, protein, carbohydrates (in the form of lactose), and fat.
Therefore, if you're looking to increase your fiber intake, you should focus on incorporating more plant-based foods into your diet, rather than relying on milk.