Will this chip work in a Dell Inspiron 660?

No. Dell Inspiron 660 uses 3rd generation Intel CPU (Ivy Bridge). This is 6th generation (Skylake). They don't even use the same socket. You wouldn't even be able to plug it in without damaging something.

Can this CPU be used in a dual-CPU setup?

No, E3 is single-processor. See "What Do Intel Processor Numbers Mean?" on Intel website.

Questions & Answers: Intel Xeon E3-1240 V5 3.5 GHz LGA 1151 80W BX80662E31240V5 Server Processor

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Intel Xeon E3-1240 V5 3.5 GHz LGA 1151 80W BX80662E31240V5 Server Processor

14nm SkyLake
4 x 256KB L2 Cache
8MB L3 Cache
80W

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