It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 644 216 is not a prime number.
For example, 644 216 can be divided by 2: 644 216 / 2 = 322 108.
For 644 216 to be a prime number, it would have been required that 644 216 has only two divisors, i.e., itself and 1.
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644 216 is an even number, because it is evenly divisible by 2: 644 216 / 2 = 322 108.
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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 644 216 is about 802.631.
Thus, the square root of 644 216 is not an integer, and therefore 644 216 is not a square number.
The square of a number (here 644 216) is the result of the product of this number (644 216) by itself (i.e., 644 216 × 644 216); the square of 644 216 is sometimes called "raising 644 216 to the power 2", or "644 216 squared".
The square of 644 216 is 415 014 254 656 because 644 216 × 644 216 = 644 2162 = 415 014 254 656.
As a consequence, 644 216 is the square root of 415 014 254 656.
The multiples of 644 216 are all integers evenly divisible by 644 216, that is all numbers such that the remainder of the division by 644 216 is zero. There are infinitely many multiples of 644 216. The smallest multiples of 644 216 are: