It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 61 421 is not a prime number.
For example, 61 421 can be divided by 17: 61 421 / 17 = 3 613.
For 61 421 to be a prime number, it would have been required that 61 421 has only two divisors, i.e., itself and 1.
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61 421 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 61 421 is about 247.833.
Thus, the square root of 61 421 is not an integer, and therefore 61 421 is not a square number.
The square of a number (here 61 421) is the result of the product of this number (61 421) by itself (i.e., 61 421 × 61 421); the square of 61 421 is sometimes called "raising 61 421 to the power 2", or "61 421 squared".
The square of 61 421 is 3 772 539 241 because 61 421 × 61 421 = 61 4212 = 3 772 539 241.
As a consequence, 61 421 is the square root of 3 772 539 241.
The multiples of 61 421 are all integers evenly divisible by 61 421, that is all numbers such that the remainder of the division by 61 421 is zero. There are infinitely many multiples of 61 421. The smallest multiples of 61 421 are: