Fail to yum install libstdc++.so.6 when installing db2 v11.5 in redhat OS

Good day, I am trying to install DB2 V11.5 (64 bit) in red hat OS. However, I having some warning message as follow: Summary of prerequisites that are not met on the current system: DBT3514W The db2prereqcheck utility failed to find the following 32-bit library file: "/lib/libpam.so*". DBT3514W The db2prereqcheck utility failed to find the following 32-bit library file: "libstdc++.so.6". Then I go to do yum install libstdc++.i686, but hitting another error which is as follow: Not understand that why the system hitting 32 bit error when I am installing 64 bits DB2. And My OS is redhat 64 bits: Kindly advise how can I continue to fix this issue? Edit ** I downloaded the db2 v11.5 from IBM website, the file name will be as follow: DB2_Svr_11.5_Linux_x86-64.tar