Gemini on Question 1, Sep 28

Is 91 a prime number? Think step by step and then answer "[Yes]" or "[No]".

To determine if 91 is a prime number, we can check if it is divisible by any prime numbers smaller than its square root (the square root of 91 is approximately 9.5, so we need to check the prime numbers 2, 3, 5, and 7).

1.Check 2: 91 does not end in an even number (0, 2, 4, 6, 8), so it is not divisible by 2.
2.Check 3: The sum of the digits is 9 + 1 = 10. Since 10 is not divisible by 3, 91 is not divisible by 3.
3.Check 5: 91 does not end in 0 or 5, so it is not divisible by 5.
4.Check 7: Let's divide 91 by 7.
•70 is 7 × 10.
•91 - 70 = 21.
•21 is 7 × 3.
•Therefore, 91 = 7 × 13.

Since 91 is divisible by 7 and 13 (meaning it has factors other than 1 and itself), it is a composite number, not a prime number.

[No]

sha256 588a65ed55fa… · 22 tokens in · 635 out · 5.5 s · via Google · stopped on its own

Sep 28, the whole day Question 1, every day

Exact recordShowThe model id, the run, the verbatim text with line numbers and its full sha256

Model: google/gemini-3.1-pro-preview
pinned google/gemini-3.1-pro-preview-20260219; alias resolved to google/gemini-3.1-pro-preview-20260219 at 2026-09-28 09:00:07 UTC (matches the pin)
Date: 2026-09-28 · run 20260928T090007Z-07d4be · scorer v1
Scored: answered · correct · format ok
sha256: 588a65ed55faf02acfba80e30a8f4013d71976a999146875a7922a05fecee739
Permalink: https://modeldrift.watch/r/2026-09-28/D1/google/gemini-3.1-pro-preview/

Scored: answered · correct · format ok
Received: 2026-09-28 09:00:20 UTC
Run: 20260928T090007Z-07d4be
Served by: Google · HTTP 200 · finish stop
Size: 761 characters · 635 tokens out incl. hidden reasoning · 5.5 s

Highlighted: the last [Yes]/[No] bracket, which is the scored answer (No).

To determine if 91 is a prime number, we can check if it is divisible by any prime numbers smaller than its square root (the square root of 91 is approximately 9.5, so we need to check the prime numbers 2, 3, 5, and 7).
1. **Check 2**: 91 does not end in an even number (0, 2, 4, 6, 8), so it is not divisible by 2.
2. **Check 3**: The sum of the digits is 9 + 1 = 10. Since 10 is not divisible by 3, 91 is not divisible by 3.
3. **Check 5**: 91 does not end in 0 or 5, so it is not divisible by 5.
4. **Check 7**: Let's divide 91 by 7. 
   - 70 is 7 × 10.
   - 91 - 70 = 21.
   - 21 is 7 × 3.
   - Therefore, 91 = 7 × 13. 
Since 91 is divisible by 7 and 13 (meaning it has factors other than 1 and itself), it is a composite number, not a prime number.
[No]

End of response · 14 lines · 761 characters · sha256 588a65ed55faf02acfba80e30a8f4013d71976a999146875a7922a05fecee739