Yes, it is Between is almost always a preposition, and here it is followed by clock times rather than "dusk and dawn" or other words, so they provide an object.
600 to 630 is a 5% increase.
620
It is 600.
It is: 600 because 29 is less than 50
630 rounded the the nearest hundred is 600. The 6 is the hundred digit and 30 is less than 50, so rounded to nearest hundred is 600.
It is around 2000 feet ( 630 Metre)
600, and 630 respectively.
510, 525, 540, 555, 570, 585, 600, 615, 630, 645, 660, 675, 690
603, 612, 621, 630, 639, 648, 657, 666, 675, 684, 693
It ends in 1, so it is rounded down to 630.
30+600+630
Many numbers are between 630 & 720 but 675 is halfway between