It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 644 012 is not a prime number.
For example, 644 012 can be divided by 2: 644 012 / 2 = 322 006.
For 644 012 to be a prime number, it would have been required that 644 012 has only two divisors, i.e., itself and 1.
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644 012 is an even number, because it is evenly divisible by 2: 644 012 / 2 = 322 006.
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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 644 012 is about 802.504.
Thus, the square root of 644 012 is not an integer, and therefore 644 012 is not a square number.
The square of a number (here 644 012) is the result of the product of this number (644 012) by itself (i.e., 644 012 × 644 012); the square of 644 012 is sometimes called "raising 644 012 to the power 2", or "644 012 squared".
The square of 644 012 is 414 751 456 144 because 644 012 × 644 012 = 644 0122 = 414 751 456 144.
As a consequence, 644 012 is the square root of 414 751 456 144.
The multiples of 644 012 are all integers evenly divisible by 644 012, that is all numbers such that the remainder of the division by 644 012 is zero. There are infinitely many multiples of 644 012. The smallest multiples of 644 012 are: