Gemini on Question 1, Sep 13

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 is an odd number (it ends in 1), 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.
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 bc5aae56072c… · 22 tokens in · 580 out · 5.4 s · via Google · stopped on its own

Sep 13, 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 2026-09-13 09:00:20 UTC (matches the pin)
Date: 2026-09-13 · run 20260913T090021Z-a7390a · scorer v1
Scored: answered · correct · format ok
sha256: bc5aae56072c0fda21c29bf2173abe2694d5fcb64a1bfe92150ba509b14dedc9
Permalink: https://modeldrift.watch/r/2026-09-13/D1/google/gemini-3.1-pro-preview/

Scored: answered · correct · format ok
Received: 2026-09-13 09:00:33 UTC
Run: 20260913T090021Z-a7390a
Served by: Google · HTTP 200 · finish stop
Size: 744 characters · 580 tokens out incl. hidden reasoning · 5.4 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 approximately 9.5, so we need to check the prime numbers 2, 3, 5, and 7).
1. **Check 2:** 91 is an odd number (it ends in 1), 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. 
   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 · 744 characters · sha256 bc5aae56072c0fda21c29bf2173abe2694d5fcb64a1bfe92150ba509b14dedc9