It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 133 221 is not a prime number.
For example, 133 221 can be divided by 3: 133 221 / 3 = 44 407.
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For 133 221 to be a prime number, it would have been required that 133 221 has only two divisors, i.e., itself and 1.
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133 221 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 133 221 is about 364.995.
Thus, the square root of 133 221 is not an integer, and therefore 133 221 is not a square number.
The square of a number (here 133 221) is the result of the product of this number (133 221) by itself (i.e., 133 221 × 133 221); the square of 133 221 is sometimes called "raising 133 221 to the power 2", or "133 221 squared".
The square of 133 221 is 17 747 834 841 because 133 221 × 133 221 = 133 2212 = 17 747 834 841.
As a consequence, 133 221 is the square root of 17 747 834 841.
The multiples of 133 221 are all integers evenly divisible by 133 221, that is all numbers such that the remainder of the division by 133 221 is zero. There are infinitely many multiples of 133 221. The smallest multiples of 133 221 are: