what how

Number

Kind and tough all at the same time

Ready to rumble yet can stop on a dime

Tired, sick, old, or just in her prime

She does the hard work and tortures the grime 

If I had to equate her to a number sign

She would definitely stand out like  a lonely prime

I wouldn’t choose 7 nor 20 minus 9

No, she’s not odd nor sour like lime 

She’s more unique and way more fine

Which number? What choice would not be a crime?

I know! She’s definitely a 2: the only one that fits and she’s all mine!
why who