Hello,
HikaMarket is an add-on for HikaShop ; thanks to the "hikashop market" plugin, it creates a bridge and add its specific features.
By disabling that plugin, most of the HikaMarket feature will be deactivated.
Uinstalling HikaMarket won't touch the database ; the data generated by HikaMarket will stay (vendors, etc).
I would recommend you to not touch the database so it will not break accidentally something. But otherwise, uninstalling HikaMarket is not an issue as long as the "hikashop / market" plugin is disable or uninstalled too.
Regards,
Jerome - Obsidev.com
HikaMarket & HikaSerial developer / HikaShop core dev team.
Also helping the HikaShop support team when having some time or couldn't sleep.
By the way, do not send me private message, use the "contact us" form instead.