How many paragraphs is a 450-550 word paper?

There's no fixed number of paragraphs for a 450-550 word paper. The number of paragraphs depends entirely on the writing style, the complexity of the ideas being presented, and the length of each paragraph.

A shorter paragraph structure might result in 10-15 paragraphs, while a longer, more discursive style could result in 5-8 paragraphs. A good rule of thumb is to aim for paragraphs that are focused on a single idea or aspect of your argument, rather than focusing on a word count per paragraph.