It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 802 644 519 is not a prime number.
For example, 802 644 519 can be divided by 3: 802 644 519 / 3 = 267 548 173.
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For 802 644 519 to be a prime number, it would have been required that 802 644 519 has only two divisors, i.e., itself and 1.
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802 644 519 is an odd number, because it is not evenly divisible by 2.
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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 802 644 519 is about 28 330.982.
Thus, the square root of 802 644 519 is not an integer, and therefore 802 644 519 is not a square number.
The square of a number (here 802 644 519) is the result of the product of this number (802 644 519) by itself (i.e., 802 644 519 × 802 644 519); the square of 802 644 519 is sometimes called "raising 802 644 519 to the power 2", or "802 644 519 squared".
The square of 802 644 519 is 644 238 223 880 741 376 because 802 644 519 × 802 644 519 = 802 644 5192 = 644 238 223 880 741 376.
As a consequence, 802 644 519 is the square root of 644 238 223 880 741 376.
802 644 519 is a number with 9 digits.
The multiples of 802 644 519 are all integers evenly divisible by 802 644 519, that is all numbers such that the remainder of the division by 802 644 519 is zero. There are infinitely many multiples of 802 644 519. The smallest multiples of 802 644 519 are: