Numara Calculator isn[SQ]t a widely known or standard calculator application for Windows. There[SQ]s no established software with that name that[SQ]s commonly used or readily available through typical download sources.

It[SQ]s possible :

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It[SQ]s a very niche or specialized calculator:

Perhaps it[SQ]s a custom-built calculator for a specific company or industry, not publicly distributed.
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The name is slightly different:

There might be a minor spelling variation, or it[SQ]s part of a larger software suite with a different overall name.
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It[SQ]s a less common or older program:

Older software can fade from general use and become less easily discoverable.

If you encountered this name somewhere (like in documentation or a conversation), providing more context would help figure out what it might be.