Question: What was the population of the republic that participated in The Battle of the Kentish Knock before this emigration?

Knowledge 1: Battle of the Kentish Knock
The Battle of the Kentish Knock (or the Battle of the Zealand Approaches) was a naval battle between the fleets of the Dutch Republic and England, fought on 28 September 1652 (8 October Gregorian calendar), during the First Anglo-Dutch War near the shoal called the Kentish Knock in the North Sea about thirty kilometres east of the mouth of the river Thames. The Dutch fleet, internally divided on political, regional and personal grounds, proved incapable of making a determined effort and was soon forced to withdraw, losing two ships and many casualties. In Dutch the action is called the "Slag bij de Hoofden". [SEP] Knowledge 2: Huguenots
After the revocation of the Edict of Nantes, the Dutch Republic received the largest group of Huguenot refugees, an estimated total of 75,000 to 100,000 people. Amongst them were 200 clergy. Many came from the region of the Cévennes, for instance, the village of Fraissinet-de-Lozère. This was a huge influx as the entire population of the Dutch Republic amounted to ca. 2 million at that time. Around 1700, it is estimated that nearly 25% of the Amsterdam population was Huguenot.[citation needed] In 1705, Amsterdam and the area of West Frisia were the first areas to provide full citizens rights to Huguenot immigrants, followed by the Dutch Republic in 1715. Huguenots intermarried with Dutch from the outset.
Knowledge 1: Battle of the Kentish Knock
The Battle of the Kentish Knock (or the Battle of the Zealand Approaches) was a naval battle between the fleets of the Dutch Republic and England, fought on 28 September 1652 (8 October Gregorian calendar), during the First Anglo-Dutch War near the shoal called the Kentish Knock in the North Sea about thirty kilometres east of the mouth of the river Thames. The Dutch fleet, internally divided on political, regional and personal grounds, proved incapable of making a determined effort and was soon forced to withdraw, losing two ships and many casualties. In Dutch the action is called the "Slag bij de Hoofden". [SEP] Knowledge 2: Witte de With
Witte Corneliszoon de With (28 March 1599 – 8 November 1658) was a Dutch naval officer. He is noted for planning and participating in a number of naval battles during the Eighty Years War and the First Anglo-Dutch war.
Knowledge 1: Battle of the Kentish Knock
The Battle of the Kentish Knock (or the Battle of the Zealand Approaches) was a naval battle between the fleets of the Dutch Republic and England, fought on 28 September 1652 (8 October Gregorian calendar), during the First Anglo-Dutch War near the shoal called the Kentish Knock in the North Sea about thirty kilometres east of the mouth of the river Thames. The Dutch fleet, internally divided on political, regional and personal grounds, proved incapable of making a determined effort and was soon forced to withdraw, losing two ships and many casualties. In Dutch the action is called the "Slag bij de Hoofden". [SEP] Knowledge 2: Mildrith
Mildrith was the daughter of King Merewalh of Magonsaete, a sub-kingdom of Mercia, and Domne Eafe (also sometimes named as Saint Eormenburga), herself the great granddaughter of King Æthelberht of Kent, and as such appearing in the so-called Kentish Royal Legend.

Answer: 2 million