Can number monsters only be destroyed by other number monsters?

In the anime, numbers can only be destroyed by other numbers. I am not sure if that also counts in the real world. Although, numbers can also be destroyed by monsters treated as numbers. This is due to its number effect. A number is not a type, but an effect. This means that it can be negated, and that when it is negated, any monsters can attack the number.

In the anime, number can only be destroy by battle by other number, and it is treated as a continous effect of a monster card, so it can be negated via skill drain.

In the real world, number monsters can be destroy by battle by non-number monster card.