Chapter 2 begins by describing the events of the seventh day of creation:
Thus the heavens and the earth were finished, and all the host of them. 2 And on the seventh day God finished his work that he had done, and he rested on the seventh day from all his work that he had done. 3 So God blessed the seventh day and made it holy (וַיְקַדֵּ֖שׁ), because on it God rested from all his work that he had done in creation. (Genesis 2:1-3 ESV)
God blessed the seventh day and made it holy. The word holy is וַיְקַדֵּ֖שׁ which is sometimes translated as consecrated. One element of the meaning is to set apart (Strong's 6942)
The remembrance of the seventh day is that it is to be set apart from the other six days:
“Remember the Sabbath day, to keep it holy. 9 Six days you shall labor, and do all your work, 10 but the seventh day is a Sabbath to the Lord your God. On it you shall not do any work, you, or your son, or your daughter, your male servant, or your female servant, or your livestock, or the sojourner who is within your gates. 11 For in six days the Lord made heaven and earth, the sea, and all that is in them, and rested on the seventh day. Therefore the Lord blessed the Sabbath day and made it holy. (Exodus 20:8-11 ESV)
Whether or not it was intended, the Chapter divisions in Genesis 1 and 2 follow the command to set apart the seventh day. The first six days are found in Genesis 1 and the seventh day is found in Genesis 2.
If this was intentional, then it was to apply the command to the fullest extent possible: a division was placed so the written word of the seventh day was truly set apart from the first six days. If it was unintentional then it can be seen as done through inspiration from the Holy Spirit who understood the significance of having the division.