Gemini on Question 1, Sep 16

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.

Step 1: Check if it is divisible by 2.
91 ends in 1, which is an odd number, so it is not divisible by 2.

Step 2: Check if it is divisible by 3.
The sum of its digits is 9 + 1 = 10. Since 10 is not divisible by 3, 91 is not divisible by 3.

Step 3: Check if it is divisible by 5.
91 does not end in 0 or 5, so it is not divisible by 5.

Step 4: Check if it is divisible by 7.
Let's divide 91 by 7:
91 = 70 + 21
70 ÷ 7 = 10
21 ÷ 7 = 3
10 + 3 = 13.
So, 7 × 13 = 91.

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

[No]

sha256 378698c7163b… · 22 tokens in · 650 out · 5.8 s · via Google · stopped on its own

Sep 16, 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 2026-09-16 09:00:03 UTC (matches the pin)
Date: 2026-09-16 · run 20260916T090004Z-fdcf7b · scorer v1
Scored: answered · correct · format ok
sha256: 378698c7163b93d44e75734fb7d34ddfc792b8450ad260cacf52d6953cd3595a
Permalink: https://modeldrift.watch/r/2026-09-16/D1/google/gemini-3.1-pro-preview/

Scored: answered · correct · format ok
Received: 2026-09-16 09:00:17 UTC
Run: 20260916T090004Z-fdcf7b
Served by: Google · HTTP 200 · finish stop
Size: 732 characters · 650 tokens out incl. hidden reasoning · 5.8 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. 
Step 1: Check if it is divisible by 2. 
91 ends in 1, which is an odd number, so it is not divisible by 2.
Step 2: Check if it is divisible by 3. 
The sum of its digits is 9 + 1 = 10. Since 10 is not divisible by 3, 91 is not divisible by 3.
Step 3: Check if it is divisible by 5. 
91 does not end in 0 or 5, so it is not divisible by 5.
Step 4: Check if it is divisible by 7. 
Let's divide 91 by 7:
91 = 70 + 21
70 ÷ 7 = 10
21 ÷ 7 = 3
10 + 3 = 13.
So, 7 × 13 = 91. 
Since 91 can be divided evenly by 7 and 13, it has divisors other than 1 and itself. Therefore, it is a composite number, not a prime number.
[No]

End of response · 22 lines · 732 characters · sha256 378698c7163b93d44e75734fb7d34ddfc792b8450ad260cacf52d6953cd3595a