Please a anyone identify this plant?

It's a Begonia of some type,sorry can't place the species.

yep it is a begonia. if it is one of the fibrous rooted one you divide it like you would any other perennial by cutting it up into rooted pieces.

if it is a tuberous one you can cut the tuber into pieces too but you are more likely to find the pieces rot off. in the 'olden days' cut surfaces were dusted with sulphur to prevent disease but not sure if you can buy it now.

found this site useful in the past.
https://www.national-begonia-society.co.uk/Editors%20Tutorial/ET%20Propagation.htm

or you can take cuttings when new growth starts in the spring.

Many thanks. The roots are fibrous, so I’ll cut it into sections. Is it OK to do it now?

I found this:
https://www.rhs.org.uk/Plants/95775/Begonia-grandis-subsp-evansiana/Details

yes I guess so, it will give the new pieces time to root in ready for next spring's growth.