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The phrase 'are numerous' is correct and can be used in written English.
You can use the phrase when you want to emphasize that there are many of something. For example: There are numerous factors that can affect the outcome of an experiment.
Exact(57)
There are numerous reasons.
The pitfalls are numerous.
There are numerous constraints.
Our questions are numerous.
The parallels are numerous.
They are numerous.
There are numerous examples.
Springs are numerous.
The setbacks are numerous.
His difficulties are numerous.
The cringes are numerous.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com