Gemini on Question 1, Sep 17

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 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 e82b739bc1e8… · 22 tokens in · 629 out · 6.3 s · via Google · stopped on its own

Sep 17, 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 2026-09-17 09:00:21 UTC (matches the pin)
Date: 2026-09-17 · run 20260917T090022Z-136fc3 · scorer v1
Scored: answered · correct · format ok
sha256: e82b739bc1e8bcd33579fc95a752d084abd23bf98b0a15b8956be5755b746f24
Permalink: https://modeldrift.watch/r/2026-09-17/D1/google/gemini-3.1-pro-preview/

Scored: answered · correct · format ok
Received: 2026-09-17 09:00:37 UTC
Run: 20260917T090022Z-136fc3
Served by: Google · HTTP 200 · finish stop
Size: 749 characters · 629 tokens out incl. hidden reasoning · 6.3 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 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 · 749 characters · sha256 e82b739bc1e8bcd33579fc95a752d084abd23bf98b0a15b8956be5755b746f24