glIsList returns GL_TRUE if list is the name of a display list and returns GL_FALSE if it is not, or if an error occurs. A name returned by glGenLists, but not yet associated with a display list by calling glNewList, is not the name of a display list.
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glIsList: man2/glIsList.xml
glIsList returns GL_TRUE if list is the name of a display list and returns GL_FALSE if it is not, or if an error occurs. A name returned by glGenLists, but not yet associated with a display list by calling glNewList, is not the name of a display list.