It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 780 509 674 is not a prime number.
For example, 780 509 674 can be divided by 2: 780 509 674 / 2 = 390 254 837.
For 780 509 674 to be a prime number, it would have been required that 780 509 674 has only two divisors, i.e., itself and 1.
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780 509 674 is an even number, because it is evenly divisible by 2: 780 509 674 / 2 = 390 254 837.
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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 780 509 674 is about 27 937.603.
Thus, the square root of 780 509 674 is not an integer, and therefore 780 509 674 is not a square number.
The square of a number (here 780 509 674) is the result of the product of this number (780 509 674) by itself (i.e., 780 509 674 × 780 509 674); the square of 780 509 674 is sometimes called "raising 780 509 674 to the power 2", or "780 509 674 squared".
The square of 780 509 674 is 609 195 351 207 586 304 because 780 509 674 × 780 509 674 = 780 509 6742 = 609 195 351 207 586 304.
As a consequence, 780 509 674 is the square root of 609 195 351 207 586 304.
780 509 674 is a number with 9 digits.
The multiples of 780 509 674 are all integers evenly divisible by 780 509 674, that is all numbers such that the remainder of the division by 780 509 674 is zero. There are infinitely many multiples of 780 509 674. The smallest multiples of 780 509 674 are: