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HOW?? Avoid the number at the end of the URL_PATH on import??
Try to use unique keys when you are setting url_key.Magento I think takes name and convert it to url_key, but at the stage of re-write urls if it finds they are not unique (same url used by another product) it add product_id at the end of the url.
The best and easy solution is to set url_key or use unique names to your products.