To get some basic information about the installed Linux version you can use uname -a.
This will give you something like
Linux serv03.fritz.box 3.10.0-957.1.3.el7.x86_64 #1 SMP
Thu Nov 29 14:49:43 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux
Well, we get the kernel version and the architecture.
rpm -qia ‘release‘ gives much more information
Name : nodesource-release
Version : el7
Release : 1
Architecture: noarch
Install Date: Thu 29 Nov 2018 09:01:53 AM CET
Group : System Environment/Base
Size : 3191
License : MIT
Signature : RSA/SHA256, Thu 04 Jan 2018 09:42:19 PM CET, Key ID 5ddbe8d434fa74dd
Source RPM : nodesource-release-el7-1.src.rpm
Build Date : Thu 04 Jan 2018 09:40:35 PM CET
Build Host : luthien
Relocations : (not relocatable)
URL : http://rpm.nodesource.com/pub_8.x/
Summary : N|Solid repository configuration
Description :
This package contains the NodeSource NodeJS repository
GPG key as well as configuration for yum.
Name : redhat-release-server
Version : 7.4
Release : 18.el7
Architecture: x86_64
Install Date: Tue 27 Nov 2018 01:50:07 PM CET
Group : System Environment/Base
Size : 43146
License : GPLv2
Signature : RSA/SHA256, Wed 28 Jun 2017 08:59:19 PM CEST, Key ID 199e2f91fd431d51
Source RPM : redhat-release-server-7.4-18.el7.src.rpm
Build Date : Wed 28 Jun 2017 08:36:32 PM CEST
Build Host : x86-037.build.eng.bos.redhat.com
Relocations : (not relocatable)
Packager : Red Hat, Inc. <http://bugzilla.redhat.com/bugzilla>
Vendor : Red Hat, Inc.
Summary : Red Hat Enterprise Linux Server release file
Description :
Red Hat Enterprise Linux Server release files
Name : epel-release
Version : 7
Release : 11
Architecture: noarch
Install Date: Wed 28 Nov 2018 07:54:48 AM CET
Group : System Environment/Base
Size : 24834
License : GPLv2
Signature : RSA/SHA256, Mon 02 Oct 2017 07:52:02 PM CEST, Key ID 6a2faea2352c64e5
Source RPM : epel-release-7-11.src.rpm
Build Date : Mon 02 Oct 2017 07:45:58 PM CEST
Build Host : buildvm-ppc64le-05.ppc.fedoraproject.org
Relocations : (not relocatable)
Packager : Fedora Project
Vendor : Fedora Project
URL : http://download.fedoraproject.org/pub/epel
Summary : Extra Packages for Enterprise Linux repository configuration
Description :
This package contains the Extra Packages for Enterprise Linux (EPEL) repository
GPG key as well as configuration for yum.