The mathematical mic drop moment we all needed! SpongeBob is dropping prime number facts that would make Euclid spit out his coffee.
This is peak number theory humor because both statements are hilariously true yet sound completely contradictory. The number 2 stands alone as the only even prime (since all other even numbers are divisible by 2), while 3 is indeed the only prime divisible by 3 (because... well, that's how division works).
It's the mathematical equivalent of saying "I'm the only person in the world named after me." Technically correct—the best kind of correct!