It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 642 550 016 is not a prime number.
For example, 642 550 016 can be divided by 2: 642 550 016 / 2 = 321 275 008.
For 642 550 016 to be a prime number, it would have been required that 642 550 016 has only two divisors, i.e., itself and 1.
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642 550 016 is an even number, because it is evenly divisible by 2: 642 550 016 / 2 = 321 275 008.
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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 642 550 016 is about 25 348.570.
Thus, the square root of 642 550 016 is not an integer, and therefore 642 550 016 is not a square number.
The square of a number (here 642 550 016) is the result of the product of this number (642 550 016) by itself (i.e., 642 550 016 × 642 550 016); the square of 642 550 016 is sometimes called "raising 642 550 016 to the power 2", or "642 550 016 squared".
The square of 642 550 016 is 412 870 523 061 600 256 because 642 550 016 × 642 550 016 = 642 550 0162 = 412 870 523 061 600 256.
As a consequence, 642 550 016 is the square root of 412 870 523 061 600 256.
642 550 016 is a number with 9 digits.
The multiples of 642 550 016 are all integers evenly divisible by 642 550 016, that is all numbers such that the remainder of the division by 642 550 016 is zero. There are infinitely many multiples of 642 550 016. The smallest multiples of 642 550 016 are: