It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 644 221 is not a prime number.
For example, 644 221 can be divided by 59: 644 221 / 59 = 10 919.
For 644 221 to be a prime number, it would have been required that 644 221 has only two divisors, i.e., itself and 1.
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644 221 is an odd number, because it is not evenly divisible by 2.
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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 644 221 is about 802.634.
Thus, the square root of 644 221 is not an integer, and therefore 644 221 is not a square number.
The square of a number (here 644 221) is the result of the product of this number (644 221) by itself (i.e., 644 221 × 644 221); the square of 644 221 is sometimes called "raising 644 221 to the power 2", or "644 221 squared".
The square of 644 221 is 415 020 696 841 because 644 221 × 644 221 = 644 2212 = 415 020 696 841.
As a consequence, 644 221 is the square root of 415 020 696 841.
The multiples of 644 221 are all integers evenly divisible by 644 221, that is all numbers such that the remainder of the division by 644 221 is zero. There are infinitely many multiples of 644 221. The smallest multiples of 644 221 are: