Number at end of Baptism entry

I have found my great grandmothers baptism record and at the end of the entry there is a number. I thought it might be a reference to page number in the same book. I looked and it did not refer to anything or anyone I knew. Any suggestions as to what the number refers to?
 
Can you provide a link so we can have a look at the entry in question?
How to do this is explained here, for example.
 
Thank you. Zooming in closer I can see it it a J and not a 2.

I would like to to confirm the birth mothers maiden name. Does it look like "Henning" or "Heening"?
 
... eheliche Tochter des Bäckers da-
selbst Karl Alexander Boldt und der
Maria Elisabeth geb. [geborene / nee] Hennings [Henning] (38 J.)
4. Kd. [Kind]
 
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