It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 644 001 564 is not a prime number.
For example, 644 001 564 can be divided by 2: 644 001 564 / 2 = 322 000 782.
For 644 001 564 to be a prime number, it would have been required that 644 001 564 has only two divisors, i.e., itself and 1.
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644 001 564 is an even number, because it is evenly divisible by 2: 644 001 564 / 2 = 322 000 782.
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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 644 001 564 is about 25 377.186.
Thus, the square root of 644 001 564 is not an integer, and therefore 644 001 564 is not a square number.
The square of a number (here 644 001 564) is the result of the product of this number (644 001 564) by itself (i.e., 644 001 564 × 644 001 564); the square of 644 001 564 is sometimes called "raising 644 001 564 to the power 2", or "644 001 564 squared".
The square of 644 001 564 is 414 738 014 434 446 080 because 644 001 564 × 644 001 564 = 644 001 5642 = 414 738 014 434 446 080.
As a consequence, 644 001 564 is the square root of 414 738 014 434 446 080.
644 001 564 is a number with 9 digits.
The multiples of 644 001 564 are all integers evenly divisible by 644 001 564, that is all numbers such that the remainder of the division by 644 001 564 is zero. There are infinitely many multiples of 644 001 564. The smallest multiples of 644 001 564 are: