It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 780 644 is not a prime number.
For example, 780 644 can be divided by 2: 780 644 / 2 = 390 322.
For 780 644 to be a prime number, it would have been required that 780 644 has only two divisors, i.e., itself and 1.
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780 644 is an even number, because it is evenly divisible by 2: 780 644 / 2 = 390 322.
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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 780 644 is about 883.541.
Thus, the square root of 780 644 is not an integer, and therefore 780 644 is not a square number.
The square of a number (here 780 644) is the result of the product of this number (780 644) by itself (i.e., 780 644 × 780 644); the square of 780 644 is sometimes called "raising 780 644 to the power 2", or "780 644 squared".
The square of 780 644 is 609 405 054 736 because 780 644 × 780 644 = 780 6442 = 609 405 054 736.
As a consequence, 780 644 is the square root of 609 405 054 736.
The multiples of 780 644 are all integers evenly divisible by 780 644, that is all numbers such that the remainder of the division by 780 644 is zero. There are infinitely many multiples of 780 644. The smallest multiples of 780 644 are: