[Python] Determine Prime Number in Python DataFrame

I have dataframe like this:

Name Email Trx
0 John john.doe@gmail.com 30
1 Sarah sarah@gmail.com 7
2 Bob bob@yahoo.com 11
3 Chad chad@outlook.com 21
4 Karen karen@outlook.com 20
5 Dmitri dmitri@rocketmail.com 17


and I need to know whether the respective customer eligible for a voucher or not. The criteria is if the trx is a prime number, the customer is eligible, else it's not eligible. The dataframe should be like this:

Name Email Trx Voucher
0 John john.doe@gmail.com 30 not eligible
1 Sarah sarah@gmail.com 7 eligible
2 Bob bob@yahoo.com 11 eligible
3 Chad chad@outlook.com 21 not eligible
4 Karen karen@outlook.com 20 not eligible
5 Dmitri dmitri@rocketmail.com 17 eligible


I know how to determine prime number but not in a dataframe. Thank you in advance

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