Answer:
Yes, because it is adding "en" to it.
Written is the past participle of write
write / wrote / written.
They write everyday.
They wrote yesterday.
They have written everyday.
Write is an irregular verb because the past is not formed by adding -ed to the verb.
regular verb - walk / walked. slice / sliced, talk / talked
irregular verb - write / wrote, eat / ate, run / ran, swim / swam