It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 640 320 016 is not a prime number.
For example, 640 320 016 can be divided by 2: 640 320 016 / 2 = 320 160 008.
For 640 320 016 to be a prime number, it would have been required that 640 320 016 has only two divisors, i.e., itself and 1.
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640 320 016 is an even number, because it is evenly divisible by 2: 640 320 016 / 2 = 320 160 008.
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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 640 320 016 is about 25 304.545.
Thus, the square root of 640 320 016 is not an integer, and therefore 640 320 016 is not a square number.
The square of a number (here 640 320 016) is the result of the product of this number (640 320 016) by itself (i.e., 640 320 016 × 640 320 016); the square of 640 320 016 is sometimes called "raising 640 320 016 to the power 2", or "640 320 016 squared".
The square of 640 320 016 is 410 009 722 890 240 256 because 640 320 016 × 640 320 016 = 640 320 0162 = 410 009 722 890 240 256.
As a consequence, 640 320 016 is the square root of 410 009 722 890 240 256.
640 320 016 is a number with 9 digits.
The multiples of 640 320 016 are all integers evenly divisible by 640 320 016, that is all numbers such that the remainder of the division by 640 320 016 is zero. There are infinitely many multiples of 640 320 016. The smallest multiples of 640 320 016 are: