You're looking at StableBuild's Deleted PyPI mirror - where we index all deleted packages from the Python package registry.
prime-math was reported malicious
OSV:MAL-2025-952 - Malicious code in prime-math (PyPI)

prime-math
1.0.0

This version was deleted from PyPI around 2024-12-21. Installing fails with:
$ pip3 install prime-math==1.0.0 ERROR: Could not find a version that satisfies the requirement prime-math==1.0.0
View other deleted versions of prime-math

Install through StableBuild

You can install this package from StableBuild's PyPI snapshots from before the version was deleted:
pip3 install \ -i https://YOUR_API_KEY.pypimirror.stablebuild.com/2024-12-20/ \ prime-math==1.0.0
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Or, download files manually

And install manually via pip:
prime_math-1.0.0.tar.gz (106.1KB)