Is one powerful server enough to handle 10 million a day?

Question

Data center

Is it enough, for example, one such server with 32GB RAM, 4x3.7 GHz with a 100Mbps channel. Or will it not be enough?
And another question: when you rent a server in a data center, you are given a hard base disk, for example, 100 GB, and then, if necessary, you install it? Do I understand right?
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