Hello, I'm an expert in mathematics and I'd be happy to help you with your question about the divergence of a series.
When we talk about a series being divergent, we're usually referring to an infinite series where the sum does not approach a finite number as the number of terms increases. A series can be arithmetic, geometric, or more complex, and there are various tests to determine if a series is divergent, such as the Divergence Test, the Integral Test, the Ratio Test, and others.
Without specific information about the series that "Number 4" refers to, it's impossible to definitively say whether it is divergent or not. If "Number 4" is a term in a series, we would need to know the entire series or the pattern of the series to apply a convergence or divergence test.
If you can provide more details about the series in question, I would be able to give a more precise answer.
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