#PHP, 21 bytes
PHP, 21 bytes
<?=(-1)**$argn**.5<2;
If the square root is not an integer number, (-1)**$argn**.5 is NAN.
#PHP, 21 bytes
<?=(-1)**$argn**.5<2;
If the square root is not an integer number, (-1)**$argn**.5 is NAN.
PHP, 21 bytes
<?=(-1)**$argn**.5<2;
If the square root is not an integer number, (-1)**$argn**.5 is NAN.