X-axis label tickmarks - number formatting

A quick (an easy?) question:

I have a numeric, integer label which I am using for the X-axis.
Numbers start from 1, up to "something large". When
"something large" is less than 10,000 the numbers appear
as normal, in 1000 or 2000 interval steps. However, if the
"something large" exceeds that, the numbers are formatted
in exponential notation.

ie. 0.2 0.4 0.6... followed by a rather large and ugly-looking
x1e+4

which appears on the same line as the X-axis legend.

Is there is a simple way to avoid exponential notation?

Thanks
Derek

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