It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 615 644 is not a prime number.
For example, 615 644 can be divided by 2: 615 644 / 2 = 307 822.
For 615 644 to be a prime number, it would have been required that 615 644 has only two divisors, i.e., itself and 1.
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615 644 is an even number, because it is evenly divisible by 2: 615 644 / 2 = 307 822.
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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 615 644 is about 784.630.
Thus, the square root of 615 644 is not an integer, and therefore 615 644 is not a square number.
The square of a number (here 615 644) is the result of the product of this number (615 644) by itself (i.e., 615 644 × 615 644); the square of 615 644 is sometimes called "raising 615 644 to the power 2", or "615 644 squared".
The square of 615 644 is 379 017 534 736 because 615 644 × 615 644 = 615 6442 = 379 017 534 736.
As a consequence, 615 644 is the square root of 379 017 534 736.
The multiples of 615 644 are all integers evenly divisible by 615 644, that is all numbers such that the remainder of the division by 615 644 is zero. There are infinitely many multiples of 615 644. The smallest multiples of 615 644 are: