Gemini on Question 1, Sep 18

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 between 9 and 10, so we check 2, 3, 5, and 7).

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

Since 91 can be divided evenly by 7 and 13, it has factors other than 1 and itself. Therefore, it is a composite number, not a prime number.

[No]

sha256 3d44922f1d51… · 22 tokens in · 723 out · 6.4 s · via Google · stopped on its own

Sep 18, 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 2026-09-18 09:00:22 UTC (matches the pin)
Date: 2026-09-18 · run 20260918T090022Z-92b6f7 · scorer v1
Scored: answered · correct · format ok
sha256: 3d44922f1d5159485b679194ead49acd494c749a651a69f7d418a2a7be266391
Permalink: https://modeldrift.watch/r/2026-09-18/D1/google/gemini-3.1-pro-preview/

Scored: answered · correct · format ok
Received: 2026-09-18 09:00:37 UTC
Run: 20260918T090022Z-92b6f7
Served by: Google · HTTP 200 · finish stop
Size: 756 characters · 723 tokens out incl. hidden reasoning · 6.4 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 between 9 and 10, so we check 2, 3, 5, and 7).
1. **Check 2:** 91 is not an even number (it does not end in 0, 2, 4, 6, or 8), so it is not divisible by 2.
2. **Check 3:** The sum of the digits of 91 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. 
   7 × 10 = 70. 
   91 - 70 = 21. 
   7 × 3 = 21. 
   Therefore, 7 × 13 = 91.
Since 91 can be divided evenly by 7 and 13, it has factors other than 1 and itself. Therefore, it is a composite number, not a prime number.
[No]

End of response · 14 lines · 756 characters · sha256 3d44922f1d5159485b679194ead49acd494c749a651a69f7d418a2a7be266391