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Sorry if this question have been already asked. My ISP is providing multiple public IP's on an interface. Can I use an unmanaged switch to conect to ISP's interface and then connect this switch to multiple routers (Draytek/TP link) to make use of these IP's?

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Yes, most often. It depends on how exactly your ISP connects your IP addresses into their network.

Usually, you're given a subnet where one IP address is used by their router - e.g. 192.0.2.32/28 with the router on .33, and .34 through .46 for you to use. You can then connect a firewall and map those addresses into your network, but you can just as well connect a (managed or unmanaged) switch and behind that individual devices with one address each. This is the most common method for small, ISP-owned ranges.

Another variant is to provide you with a point-to-point address (/31 or /30 prefix) and another subnet that needs to routed over that p2p address. That way, a router on your side is always required. Since there's no NAT, you could also use a layer-3 switch with an appropriate routing setup. This setup is common if you own an IP range yourself and have it routed through your ISP (with or without BGP).

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