In order to check if your Linux server is 64 bit or 32 bit, you can run the following command.

uname -a

If the output has “i686” or “i386”, the linux server is 32-Bit.

If the output has “x86_64”, the linux server is 64-bit

 

Reference:

http://www.howtogeek.com/198615/how-to-check-if-your-linux-system-is-32-bit-or-64-bit/