Many Linux distributions are intended for home users.
This is the problem, no one really knows. Unlike Windows or OS X, Linux doesn't really have you "register" or phone home to anyone, so no statistic on how many Linux users there are is accurate. I personally estimate Linux users number at least as much as OS X users, though many will not agree with me.
It has over 498750565 members worldwide
Linux and the many variations based on Linux (Ubuntu, Mint, to name but two) are aimed at any one who wishes to use it, and is available for free.
1 million
The 2.6 Linux kernel supports up to 4,294,967,296 user IDs. The 2.4 kernel only supports 65,536.
The users and developers.
Finding software to help run cloud computing Linux can be difficult for some people. If you are new to using the Linux operating system, you may not know where to find the best computer networking software. Many software stores carry only a few networking software tools for Linux operating system users. If you look for software online, there are many more products for Linux users are retailers on the internet.
In general Linux has no restrictions on the number of users in a server. Commercial Unix vendors vary in what they allow by licensing, so it depends on the vendor.
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No accurate figure can be given, though there are many millions.
That depends on whether you are asking whether more people use Windows or Linux or which system supports more users. The maximum number of users in a modern Linux system is 4,294,967,295. Windows doesn't have any specific limit that has been published, but each account takes up a significant amount of space, limiting the number to well below the limit in Linux. As to how many people use them, more people use Windows on their personal computers than Linux.