Is it safe to walk on this sprained ankle yet? it's been 2 weeks.

Depends: Time is not as much a factor as how you feel. You can try it and see if painful or not. If overly concerned walk with an ankle brace at first.

Yes but carefully: Yes, but carefully and with bracing or supports may benefit you. It takes 3-4 weeks for ligaments to heal, so gentle range of motion helps decrease swelling and allows increased healing. Hope this helps!

Via diagnosis: If it was truly a sprain and x-rays taken and treatment was rendered, gradual return to activity is the norm. The old school way of treating these included a cast for some weeks. Nowadays, returning function asap is the norm, but with in reason. If pain and swelling persist you should consider further evaluation. An ankle support/brace helps protect the ligaments while they are healing.