It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 331 221 is not a prime number.
For example, 331 221 can be divided by 3: 331 221 / 3 = 110 407.
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For 331 221 to be a prime number, it would have been required that 331 221 has only two divisors, i.e., itself and 1.
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331 221 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 331 221 is about 575.518.
Thus, the square root of 331 221 is not an integer, and therefore 331 221 is not a square number.
The square of a number (here 331 221) is the result of the product of this number (331 221) by itself (i.e., 331 221 × 331 221); the square of 331 221 is sometimes called "raising 331 221 to the power 2", or "331 221 squared".
The square of 331 221 is 109 707 350 841 because 331 221 × 331 221 = 331 2212 = 109 707 350 841.
As a consequence, 331 221 is the square root of 109 707 350 841.
The multiples of 331 221 are all integers evenly divisible by 331 221, that is all numbers such that the remainder of the division by 331 221 is zero. There are infinitely many multiples of 331 221. The smallest multiples of 331 221 are: