phone 2a pre-applied screen protector irremovable?

i have a phone 2a and wanted to apply my tempered glass now after the what i had thought to be a plastic screen protector has scratched. when i try to remove it though i cna't get it off. it sticks to the screen so strongly that my fingernails can't get a grip... is it even removable or is it something like that what the samsung fold had back then and when you remove it the phone breaks?