Question

what is twice prime numbe
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Answer 1

A twice prime number is defined as a prime number whose digits are also prime. For example: isprime. It is made up of the digit , which is prime, and the digit , which is also prime.

Answer 2

A twice prime number is defined as a prime number whose digits are also prime. For example: 23 is prime. It is made up of the digit 2, which is prime, and the digit 3, which is also prime. Therefore, 23 is twice prime. Counter example: 19 is prime, but 1 nor 9 is prime and therefore 19 is not twice prime.

or

A twice prime number is defined as a prime number whose digits are also prime.

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