It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 780 734 is not a prime number.
For example, 780 734 can be divided by 2: 780 734 / 2 = 390 367.
For 780 734 to be a prime number, it would have been required that 780 734 has only two divisors, i.e., itself and 1.
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780 734 is an even number, because it is evenly divisible by 2: 780 734 / 2 = 390 367.
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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 780 734 is about 883.592.
Thus, the square root of 780 734 is not an integer, and therefore 780 734 is not a square number.
The square of a number (here 780 734) is the result of the product of this number (780 734) by itself (i.e., 780 734 × 780 734); the square of 780 734 is sometimes called "raising 780 734 to the power 2", or "780 734 squared".
The square of 780 734 is 609 545 578 756 because 780 734 × 780 734 = 780 7342 = 609 545 578 756.
As a consequence, 780 734 is the square root of 609 545 578 756.
The multiples of 780 734 are all integers evenly divisible by 780 734, that is all numbers such that the remainder of the division by 780 734 is zero. There are infinitely many multiples of 780 734. The smallest multiples of 780 734 are: