Find two prime numbers that, if multiplied, would generate a 400-digit number.

https://www.askmehelpdesk.com/mathematics/two-primes-generate-400-digit-number-351817.html

This same question has been asked a dozen times. Where is this coming from that it is so popular?

Apparently, the questions from 'give the lab instruments and their uses' ones died out... that one has just come up. Again another question which keeps coming up I guess...