Minimum cpu required for 1 gb of ram

I have a server with 8 core and 768 ddr4 ram, if i create 700 VM’s with 1 GB of ram each, what should i set my CPU to, is it possible to create 700 VM with so less CPU core ?

I don’t know about 700 VM’s in real practice.
But you can use overcommit for cpu or fraction in VM’s CPU capacity (for example 1 vcpu = 0.1 real cpu)