No, the term "existing" does not necessarily imply being constantly present. "Existing" refers to the state of something being real, having objective reality, or being in existence at a given time. It means that something is present or has existence in some form, but it does not imply that it is constantly or continuously present.
For example, an object can exist even if it is not currently being observed or actively interacting with other objects. It may exist in a particular location or state for a period of time and then undergo changes or move to a different state. In this case, it existed at a specific time but may not be constantly present.
Similarly, concepts or ideas can exist without a constant physical presence. For instance, mathematical concepts or philosophical ideas exist as abstract entities or mental constructs, but they are not physically present in the same way that a tangible object is.
In summary, "existing" refers to the state of something being real or having existence, but it does not necessarily mean that it is constantly or continuously present.