this mean case numbers between 400 and 500 e.g. at the start of March:
The key points you need to know from today is NPHET briefing
Any number between 20 and 22.36
500
456
453
400
How about 450
102
400 of them.
432, 468
400 to 500
Assuming the question is the wrong way round, and meant to read 'between 400 and 500', then 441 = 21 x 21 484 = 22 x 22 as there are many under 400 and an infinite number over 500.
408 = 12 x 34