Is 11 a private number?

Last night I was discussing numbers with my 5 year old niece. She asked what my favorite number was, so I said 7 and 13 because they were odd numbers and they are prime numbers. She informed me that she doesn't like odd numbers because there are "left overs" but with even numbers there are not. So while driving today she said "Auntie is 11 a private number too?"