Steamed my Samsung Galaxy j 7 prime to my chrome cast without wifi

You can't.
You have two options though.
If the TV has it's own streaming apps you could use your phone as a Wifi hotspot.
If the phone is MHL compatible then you could get a converter and connect it to the TV with a cable.
https://www.bhg.com/shop/samsung-samsung-galaxy-j7-prime-mhl-6-6-micro-usb-to-hdmi-adapter-and-usb-2-0-cable-p933d629d091329c735fcbc4fccf33561.html
Make sure your phone is MHL compatible before you buy an adapter.
https://play.google.com/store/apps/details?id=com.wikimediacom.MHLChecker&hl=en_US
 
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