Justin wrote the following indirect proof:
Prove: 7 is a factor of 91.
Step 1: Assume that 7 is a factor of 91.
Step 2: 91 divided by 7 is 13.
Step 3: A factor is an integer by which another integer is divisible.
Step 4: Therefore, 7 must be a factor of 91.
Which step in Justin's proof is incorrect?
Step 1
Step 2
Step 3
Step 4

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I don't get this problem because they are all correct

I don't see a problem in step 3.

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