Any 64bit system with 32bit emulation in the kernel can chroot.
As for checking,
cat > dummy.c << "EOF" &&
#include <stdio.h>
int main() {
printf("Hi!\n");
}
EOF
(gcc -m32 dummy.c -o dummy &&
./dummy | grep "Hi" >/dev/null) || echo "You can not run 32bit programs"
If the program can run it will print Hi. if grep doesn't see Hi you can
take action todo what ever you want.
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