Question

how many devices could we connect to a bluetooth device

Answer 1

You can connect multiple devices at a time bt there r few limitations for example :
you can have a bluetooth keyboard, mouse, and headset connected at the same time, and an A2DP (Advanced Audio Distribution Profile) device to stream music, but you can't have two devices that performing the same service profile connected at the same time.

Answer 2

Yes you can connect devices by Bluetooth but there are some limitations .. if we connect too much of devices on a mobile it will not respond because mobile can't handle it so,always check specification of your devices and Connect