I never heard of 1620 AP. It must be 1602 ??????
NO it does not have WLC functionally inbuild. its Either a CAPWAP or standalone AP.
Run the sh version command and check...
CAPWAP(k9w8): Then you will need a WLC to use this AP
Standalone(K9w7): You can configure this AP and use it .
Understand the image here: https://rscciew.wordpress.com/2014/01/04/understand-access-point-ios-images/
Regards
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