Oooh, I never thought about reading the script! When this came out in 1997 internet was a thing, but not the same it is today.

You're right, she pauses after numbers which are obviously not prime (when primes were the known working theory)

We could argue that it's a very stressful situation and she pauses to think because it's not a relaxed moment and she doesn't want to get it wrong or another possibility is let the audience think for themselves and realize they couldn't have been prime, but then it would have been better if she had said loudly what the numbers were and the easy rule to exclude them