Determine Whether the Statement Is True or False $\text { If } \mathrm { n } \text { is a prime number, then the Mersenne number } 2 ^ { \mathrm { n } } - 1 \text { is also a prime number. }$

Determine whether the statement is true or false.
- $\text { If } \mathrm { n } \text { is a prime number, then the Mersenne number } 2 ^ { \mathrm { n } } - 1 \text { is also a prime number. }$