According to Intel, the Intel HD Graphics 620 theoretically supports up to three monitors and with one certainly 4096x2160 at 60Hz. The dual-core processor of the previous processor family with Intel Iris 540 can at least display one monitor with 3440x1440 (60Hz) and one with 2560x1600 (60Hz). So for office applications, that's certainly enough. I hope this answer is enough for you.
how did you connect the two monitors? i have two monitors with hdmi connectors and tried a displayport splitter to 2x hdmi with no success no signal on the screens......