No, unless you want to get a new internet service provider. However you can get programmes that mask your ip adress or scramble it.. Google a programme called JAP if your intrested. Lecsiy
Depends if your IP is static or dynamic, you cannot change a static address but you can force a change in a dynamic one.
As sjb007 rightly said it all depends on your ISP and if they've assigned you a static ISP or a dynamic one, which changes whenever your router/modem is reset. Call up your ISP and ask them.
yes, you can change your ip if you are running from modem to computer no router. programHCP IP Forcer you can google it and find it