May i ask is that possible to fix the cipher text in range 1000 to 2000 after the process of encryption?

May i ask is that possible to fix the cipher text in range 1000 to 2000 after the process of encryption? Is that the plaintext will affect the value of ciphertext? The method i use for encryption is RSA.

[Image Analyst]

You can do/try whatever you want but we can't help you write encryption code.