[darksaints]

No, the exhaust is not the primary thrust generator, unless you're talking about military jets. The fans themselves are creating the majority of the propulsion. Modern high bypass designs have bypass ratios of ~10:1, meaning for every 1 lb thrust generated from the exhaust, 10 lbs comes from the fan.

https://en.wikipedia.org/wiki/Bypass_ratio

[catalogia]

Note that modern military jets have low bypass ratios, but not zero. They use low-bypass turbofan engines, not turbojets. Even cruise missiles use turbofans rather than turbojets. I think the only place you might see a turbojet flying today is in RC scale aircraft.