9949
This number is a prime.
The largest four-digit prime number that is turned into a composite number if any digit is deleted.
The largest four-digit prime whose digits are perfect squares. [Silva]
(There are 3 curios for this number that have not yet been approved by an editor.)
Printed from the PrimePages <t5k.org> © G. L. Honaker and Chris K. Caldwell