It is: 11
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The lowest two-digit prime number is 11.11.
23
The smallest prime number in which all of the digits are also prime is 2.The smallest multi-digit prime number in which all of the digits are also prime is 23.
Greatest 2 digit prime number is 97. Lease 2 digit prime number is 11.
The lowest two prime numbers are: 2 & 3.