Black holes are not typically considered to be four-dimensional objects. In the field of physics, dimensions are often used to describe the spatial extent of an object. In our everyday experience, we are familiar with three dimensions: length, width, and height.
Black holes, as described by general relativity, are regions of space where the gravitational pull is so strong that nothing, not even light, can escape from them. They are formed when massive stars collapse under their own gravity. According to our current understanding, black holes exist in three dimensions, just like any other object in our universe.
However, it is worth noting that black holes have some peculiar properties due to their extreme gravitational effects. They can distort space and time around them, leading to phenomena such as time dilation and gravitational lensing. These effects are described within the framework of general relativity, which incorporates the concept of a four-dimensional spacetime. In this sense, black holes are influenced by and interact with the four-dimensional fabric of spacetime, but they themselves are not inherently four-dimensional objects.
It's important to distinguish between the concept of spacetime, which is a four-dimensional framework used to describe the universe, and the objects or structures that exist within it, such as black holes, which typically have a three-dimensional nature.