Scatter Plot is not visible using notebook

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Instead of using ScatterPlot, which is a helper class, use scatter_plot as follows.

sage: x = scatter_plot([(x, len(divisors(x))) for x in range(2, 100000)], facecolor='white', marker='s')
sage: x
Launched png viewer for Graphics object consisting of 1 graphics primitive

Or you could use Sage's plot2d as follows:

sage: x = point2d(((x, len(divisors(x))) for x in range(2, 100000)))
sage: x
Launched png viewer for Graphics object consisting of 1 graphics primitive