Gemini on Question 1, Oct 2

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 2, 3, 5, and 7).

1.Check 2: 91 is an odd 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
7 × 3 = 21
70 + 21 = 91.
Therefore, 91 divided by 7 is exactly 13.

Because 91 has divisors other than 1 and itself (7 and 13), it is a composite number, not a prime number.

[No]

sha256 7b15be905232… · 22 tokens in · 883 out · 7.2 s · via Google · stopped on its own

Oct 2, 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 2026-10-02 09:00:07 UTC (matches the pin)
Date: 2026-10-02 · run 20261002T090008Z-e178a0 · scorer v1
Scored: answered · correct · format ok
sha256: 7b15be90523209757b7a84c638f261c3ebdbea641a544fe279f924acd3da1e7c
Permalink: https://modeldrift.watch/r/2026-10-02/D1/google/gemini-3.1-pro-preview/

Scored: answered · correct · format ok
Received: 2026-10-02 09:00:25 UTC
Run: 20261002T090008Z-e178a0
Served by: Google · HTTP 200 · finish stop
Size: 739 characters · 883 tokens out incl. hidden reasoning · 7.2 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 2, 3, 5, and 7).
1. **Check 2:** 91 is an odd 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
   7 × 3 = 21
   70 + 21 = 91. 
   Therefore, 91 divided by 7 is exactly 13.
Because 91 has divisors other than 1 and itself (7 and 13), it is a composite number, not a prime number.
[No]

End of response · 14 lines · 739 characters · sha256 7b15be90523209757b7a84c638f261c3ebdbea641a544fe279f924acd3da1e7c