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Look at Help -> About Eclipse IDE. This will tell which product and version thereof that you have installed.
Eclipse and eclipse based applications no longer run on 32 bit platforms or 32 bit JVM. Only 64-bit platforms/JVM are supported.
Unless you are actually developing an Eclipse-plugin, you will never know the difference. If you are developing an Eclipse-plugin, you should install a 32 bit version of Eclipse to use as your reference platform, and still develop the program using a different copy of Eclipse.
There can be the 64bit VM. With the -vm parameter you specify the JRE to start Eclipse. With the installed VMs you specify the VM to run you code.
Hit Ctrl+Alt+Del to open the Windows Task manager and switch to the processes tab.
32-bit programs should be marked with *32.
Open eclipse.ini in the installation directory, and observe the line with text:
plugins/org.eclipse.equinox.launcher.win32.win32.x86_64_1.0.200.v20090519 then it is 64 bit.
If it would be plugins/org.eclipse.equinox.launcher.win32.win32.x86_32_1.0.200.v20090519 then it is 32 bit.
Help -> About Eclipse -> Installation Details -> tab Configuration
Look for -arch, and below it you'll see either x86_64 (meaning 64bit) or x86 (meaning 32bit).
In Linux, run file on the Eclipse executable, like this:
$ file /usr/bin/eclipse
eclipse: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), dynamically linked (uses shared libs), for GNU/Linux 2.4.0, not stripped
Go to the Eclipse base folder → open eclipse.ini → you will find the below line at line no 4:
plugins/org.eclipse.equinox.launcher.win32.win32.x86_64_1.1.200.v20150204-1316 plugins/org.eclipse.equinox.launcher.win32.win32.x86_1.1.200.v20120913-144807
As you can see, line 1 is of 64-bit Eclipse. It contains x86_64 and line 2 is of 32-bit Eclipse. It contains x_86.
For 32-bit Eclipse only x86 will be present and for 64-bit Eclipse x86_64 will be present.
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