There is a quick and effective way to disable these console.
1) Open /etc/inittab file and look for the section
1:2345:respawn:/sbin/mingetty --noclear tty1
2:2345:respawn:/sbin/mingetty tty2
3:2345:respawn:/sbin/mingetty tty3
4:2345:respawn:/sbin/mingetty tty4
5:2345:respawn:/sbin/mingetty tty5
6:2345:respawn:/sbin/mingetty tty6
As you can see above there are 6 lines (one for each virtual console), simpily placing "#" at the begning of the line will disable that particular console. Suppose I need to disable console no 4,5,6 so, in this case my inittab file will look like ..
1:2345:respawn:/sbin/mingetty --noclear tty1
2:2345:respawn:/sbin/mingetty tty2
3:2345:respawn:/sbin/mingetty tty3
#4:2345:respawn:/sbin/mingetty tty4
#5:2345:respawn:/sbin/mingetty tty5
#6:2345:respawn:/sbin/mingetty tty6
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source:http://linuxpoison.blogspot.com/2008/08/13578175715198.html