Q: Is 636,620 a Prime Number?
A: No, 636,620 is not a prime number.
A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 636620 can be evenly divided by 1 2 4 5 10 20 139 229 278 458 556 695 916 1,145 1,390 2,290 2,780 4,580 31,831 63,662 127,324 159,155 318,310 and 636,620, with no remainder.
Since 636,620 cannot be divided by just 1 and 636,620, it is not a prime number.