It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 640 324 is not a prime number.
For example, 640 324 can be divided by 2: 640 324 / 2 = 320 162.
For 640 324 to be a prime number, it would have been required that 640 324 has only two divisors, i.e., itself and 1.
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640 324 is an even number, because it is evenly divisible by 2: 640 324 / 2 = 320 162.
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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 640 324 is about 800.202.
Thus, the square root of 640 324 is not an integer, and therefore 640 324 is not a square number.
The square of a number (here 640 324) is the result of the product of this number (640 324) by itself (i.e., 640 324 × 640 324); the square of 640 324 is sometimes called "raising 640 324 to the power 2", or "640 324 squared".
The square of 640 324 is 410 014 824 976 because 640 324 × 640 324 = 640 3242 = 410 014 824 976.
As a consequence, 640 324 is the square root of 410 014 824 976.
The multiples of 640 324 are all integers evenly divisible by 640 324, that is all numbers such that the remainder of the division by 640 324 is zero. There are infinitely many multiples of 640 324. The smallest multiples of 640 324 are: