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Not necesarily.
But verbs can have more than one perfective form. And with verbs of motion they can have loads and loads.

My dictionary does only give one perfective form and that is c-
But I...

Prefixes, not endings.


My dictionary says с- makes it perfective.

Verbs of motion exist in many forms. Each verb of motion has a multidirectional and unidirectional form.

The imperfective forms are:
бегать is the multidirectional
бежать is unidirectional
...