Thanks for your help. After trying what you said, I finally realized that getAlbumPage only applies to the current image, not the current album (it kept returning 0).
I searched further and discovered there is a getCurrentPage() function(!).
So this is the code that worked (again, thanks to you for getting me here):
`
<?php if ((getCurrentPage()) > 1) {
echo '(Page '.getCurrentPage().')';};?>
`