To be even more specific, these CPU are produced by Marvell under the name Armada 370/XP (according /proc/cpuinfo), and are based on ARM's Cortex A9 design (source: https://scaleway.com/faq/server/#-Why-did-you-choose-ARM ).
According to /proc/cpuinfo, CPU Implementer is 0x56 ('V' = Marvell) and CPU part is 0x584 (Marvell Armada XP). This is most likely not Cortex A9 (which would have CPU Implementer == 0x41 and CPU part == 0xC09), but Marvell's own PJ4 microarchitecture.
Maybe yes. I'm not part of the hardware team so I can't really tell. Was just quoting the FAQ here.