It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 640 624 is not a prime number.
For example, 640 624 can be divided by 2: 640 624 / 2 = 320 312.
For 640 624 to be a prime number, it would have been required that 640 624 has only two divisors, i.e., itself and 1.
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640 624 is an even number, because it is evenly divisible by 2: 640 624 / 2 = 320 312.
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A number is a perfect square (or a square number) if its square root is an integer; that is to say, it is the product of an integer with itself. Here, the square root of 640 624 is about 800.390.
Thus, the square root of 640 624 is not an integer, and therefore 640 624 is not a square number.
The square of a number (here 640 624) is the result of the product of this number (640 624) by itself (i.e., 640 624 × 640 624); the square of 640 624 is sometimes called "raising 640 624 to the power 2", or "640 624 squared".
The square of 640 624 is 410 399 109 376 because 640 624 × 640 624 = 640 6242 = 410 399 109 376.
As a consequence, 640 624 is the square root of 410 399 109 376.
The multiples of 640 624 are all integers evenly divisible by 640 624, that is all numbers such that the remainder of the division by 640 624 is zero. There are infinitely many multiples of 640 624. The smallest multiples of 640 624 are: