Is my VLAN 1 a security risk?

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http://serverfault.com – First of all I'm relatively new to VLANs. I have a ZyXEL GS-1524 switch and two networks that I want to keep separate, but they need to use the same router. The router is on port 22, ports 17 and 18 belong to the first network, and all other ones to the second. The issue is that my switch requires all ports to be on VLAN 1. It did not seem to suffice to create only VLAN 2 for the first network, because the same ports belong to VLAN 1 and anything connected to a port belonging to VLAN 1 would be able to reach it. Therefore I created two new VLANs: VLAN 2 for the first network and VLAN 3 for (HowTos)