Gemini on Question 1, Sep 30

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

To determine if 91 is a prime number, we need to check if it has any positive divisors other than 1 and itself. We can do this by testing for divisibility by smaller prime numbers:

1.Check 2: 91 is not an even number (it doesn't end in 0, 2, 4, 6, or 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.
•We know that 7 × 10 = 70.
•That leaves 91 - 70 = 21.
•We know that 7 × 3 = 21.
•Therefore, 7 × 13 = 91.

Since 91 is divisible by 7 and 13, it has divisors other than 1 and itself. This means it is a composite number, not a prime number.

[No]

sha256 f82340d83a21… · 22 tokens in · 709 out · 6.2 s · via Google · stopped on its own

Sep 30, 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 2026-09-30 09:00:07 UTC (matches the pin)
Date: 2026-09-30 · run 20260930T090007Z-45ce12 · scorer v1
Scored: answered · correct · format ok
sha256: f82340d83a21a8ce06faf7440f90dd4f2bb4993fe630f39f6d3e31059ed3ae6d
Permalink: https://modeldrift.watch/r/2026-09-30/D1/google/gemini-3.1-pro-preview/

Scored: answered · correct · format ok
Received: 2026-09-30 09:00:20 UTC
Run: 20260930T090007Z-45ce12
Served by: Google · HTTP 200 · finish stop
Size: 772 characters · 709 tokens out incl. hidden reasoning · 6.2 s

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

To determine if 91 is a prime number, we need to check if it has any positive divisors other than 1 and itself. We can do this by testing for divisibility by smaller prime numbers:
1. **Check 2:** 91 is not an even number (it doesn't end in 0, 2, 4, 6, or 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. 
   - We know that 7 × 10 = 70.
   - That leaves 91 - 70 = 21.
   - We know that 7 × 3 = 21.
   - Therefore, 7 × 13 = 91.
Since 91 is divisible by 7 and 13, it has divisors other than 1 and itself. This means it is a composite number, not a prime number.
[No]

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